diff --git a/src/ImeSense.Launchers.Belarus.Core/Launcher.cs b/src/ImeSense.Launchers.Belarus.Core/Launcher.cs
index 7918f86..3c4e889 100644
--- a/src/ImeSense.Launchers.Belarus.Core/Launcher.cs
+++ b/src/ImeSense.Launchers.Belarus.Core/Launcher.cs
@@ -17,7 +17,7 @@ public static class Launcher
         var process = new Process {
             StartInfo = new ProcessStartInfo {
                 FileName = path,
-                Arguments = arguments != null
+                Arguments = arguments is not null
                     ? string.Join(" ", arguments)
                     : string.Empty,
                 WorkingDirectory = workingDirectory,
diff --git a/src/ImeSense.Launchers.Belarus.Core/Manager/FileDownloadManager.cs b/src/ImeSense.Launchers.Belarus.Core/Manager/FileDownloadManager.cs
index 2787a01..286a4f0 100644
--- a/src/ImeSense.Launchers.Belarus.Core/Manager/FileDownloadManager.cs
+++ b/src/ImeSense.Launchers.Belarus.Core/Manager/FileDownloadManager.cs
@@ -4,19 +4,13 @@
 
 namespace ImeSense.Launchers.Belarus.Core.Manager;
 
-public class FileDownloadManager : IFileDownloadManager
+/// <summary>
+/// Default constructor
+/// </summary>
+public class FileDownloadManager(ILogger<FileDownloadManager>? logger, HttpClient httpClient) : IFileDownloadManager
 {
-    private readonly ILogger<FileDownloadManager>? _logger;
-    private readonly HttpClient _httpClient;
-
-    /// <summary>
-    /// Default constructor
-    /// </summary>
-    public FileDownloadManager(ILogger<FileDownloadManager>? logger, HttpClient httpClient)
-    {
-        _logger = logger;
-        _httpClient = httpClient;
-    }
+    private readonly ILogger<FileDownloadManager>? _logger = logger;
+    private readonly HttpClient _httpClient = httpClient;
 
     /// <summary>
     /// Downloads a file from the specified URL and saves it to the specified path.
@@ -93,9 +87,11 @@ public async Task DownloadAsync(Uri url, string filePath, IProgress<int>? status
             }
         } catch (HttpRequestException ex) {
             _logger?.LogError("{Message}", ex.Message);
+            _logger?.LogError("{StackTrace}", ex.StackTrace);
             throw;
         } catch (Exception ex) {
             _logger?.LogError("{Message}", ex.Message);
+            _logger?.LogError("{StackTrace}", ex.StackTrace);
             throw;
         }
     }
diff --git a/src/ImeSense.Launchers.Belarus.Core/Manager/InitializerManager.cs b/src/ImeSense.Launchers.Belarus.Core/Manager/InitializerManager.cs
index 887d783..fa81581 100644
--- a/src/ImeSense.Launchers.Belarus.Core/Manager/InitializerManager.cs
+++ b/src/ImeSense.Launchers.Belarus.Core/Manager/InitializerManager.cs
@@ -255,24 +255,25 @@ private async Task<bool> IsCheckGitHubConnectionAsync(CancellationToken cancella
     private async Task<bool> IsLauncherReleaseCurrentAsync(CancellationToken cancellationToken = default)
     {
         var tags = await _gitStorageApiService.GetTagsAsync(UriStorage.LauncherApiUri, cancellationToken);
-        if (tags != null) {
-            var currentVersion = $"{ApplicationHelper.GetAppVersion()}";
-            if (currentVersion[0] != 'v') {
-                currentVersion = currentVersion.Insert(0, "v");
-            }
+        if (tags is null) {
+            return true;
+        }
 
-            var countTag = tags.Count(x => x!.Name.Equals(currentVersion));
-            if (countTag == 0) {
-                // If there is no such release, we return true so that there is no looping
-                return true;
-            }
+        var currentVersion = $"{ApplicationHelper.GetAppVersion()}";
+        if (currentVersion[0] is not 'v') {
+            currentVersion = currentVersion.Insert(0, "v");
+        }
 
-            var firstTag = tags.FirstOrDefault();
-            if (firstTag != null) {
-                return firstTag.Name.Equals(currentVersion);
-            }
+        var countTag = tags.Count(x => x!.Name.Equals(currentVersion));
+        if (countTag == 0) {
+            // If there is no such release, we return true so that there is no looping
             return true;
         }
+
+        var firstTag = tags.FirstOrDefault();
+        if (firstTag is not null) {
+            return firstTag.Name.Equals(currentVersion);
+        }
         return true;
     }
 
@@ -281,7 +282,7 @@ private async Task<bool> IsGameReleaseCurrentAsync(CancellationToken cancellatio
         var gitStorageRelease = _launcherStorage.GitHubRelease;
 
         if (File.Exists(PathStorage.CurrentRelease)) {
-            var releaseComparer = gitStorageRelease != null && await _releaseComparerService.IsComparerAsync(gitStorageRelease, cancellationToken);
+            var releaseComparer = gitStorageRelease is not null && await _releaseComparerService.IsComparerAsync(gitStorageRelease, cancellationToken);
             if (!releaseComparer) {
                 await FileSystemHelper.WriteReleaseAsync(gitStorageRelease, PathStorage.CurrentRelease, cancellationToken);
                 _logger?.LogInformation("The releases don't match. Update required!");
@@ -302,7 +303,7 @@ private async Task RemoteLoadWebResourcesAsync(CancellationToken cancellationTok
         try {
             var contents = await _gitStorageApiService
                 .DownloadJsonAsync<IEnumerable<WebResource>>(FileNameStorage.WebResources, UriStorage.BelarusApiUri, cancellationToken);
-            if (contents != null) {
+            if (contents is not null) {
                 await FileSystemHelper.WriteReleaseAsync(contents, Path.Combine(DirectoryStorage.LauncherCache, FileNameStorage.WebResources), cancellationToken);
                 _launcherStorage.WebResources = new(contents);
             }
@@ -346,7 +347,7 @@ private void AddNews(Locale? locale, List<LangNewsContent> allNews, IEnumerable<
             return;
         }
 
-        if (news != null) {
+        if (news is not null) {
             allNews.Add(new LangNewsContent(locale, news));
         } else {
             _logger?.LogError("Failure to load news in {locale}", locale.Title);
diff --git a/src/ImeSense.Launchers.Belarus.Core/Services/GitHubApiService.cs b/src/ImeSense.Launchers.Belarus.Core/Services/GitHubApiService.cs
index 50ba79c..175854a 100644
--- a/src/ImeSense.Launchers.Belarus.Core/Services/GitHubApiService.cs
+++ b/src/ImeSense.Launchers.Belarus.Core/Services/GitHubApiService.cs
@@ -22,66 +22,85 @@ public class GitHubApiService(ILogger<GitHubApiService>? logger, HttpClient http
     /// <returns>The deserialized object of type T if successful, or null if the file is not found or deserialization fails</returns>
     public async Task<T?> DownloadJsonAsync<T>(string filename, Uri? uriRepository = null, CancellationToken cancellationToken = default) where T : class
     {
-        if (uriRepository == null) {
-            if (_httpClient.BaseAddress == null) {
-                throw new NullReferenceException("No base address for HttpClient");
-            }
-            uriRepository = _httpClient.BaseAddress;
-        }
+        uriRepository ??= _httpClient.BaseAddress ?? throw new NullReferenceException("No base address for HttpClient");
 
         // Get the GitHub release information
         GitHubRelease? release;
-        if (_launcherStorage == null) {
+        if (_launcherStorage is null) {
             release = await GetLastReleaseAsync(_httpClient.BaseAddress, cancellationToken: cancellationToken);
+            _logger?.LogInformation("Retrieved last release information from server");
         } else {
             release = _launcherStorage.GitHubRelease;
+            _logger?.LogInformation("Retrieved last release information from local storage");
+        }
+
+        if (release is null || release.Assets is null) {
+            _logger?.LogWarning("Release information or assets are null");
+            return null;
         }
+
         // Find the asset with the specified filename
-        var asset = release?.Assets?.FirstOrDefault(n => n.Name.Equals(filename));
+        var asset = release.Assets.FirstOrDefault(n => n.Name.Equals(filename));
+        if (asset is null) {
+            _logger?.LogError("Asset with filename {Filename} not found", filename);
+            return null;
+        }
+
         // Download the asset
-        return await _httpClient.GetFromJsonAsync(asset?.BrowserDownloadUrl, typeof(T),
-            SourceGenerationContext.Default, cancellationToken: cancellationToken) as T;
+        var response = await _httpClient.GetAsync(asset.BrowserDownloadUrl, cancellationToken);
+        if (!response.IsSuccessStatusCode) {
+            _logger?.LogError("Failed to download asset from {BrowserDownloadUrl}. Status code: {StatusCode}",
+                asset.BrowserDownloadUrl, response.StatusCode);
+            return null;
+        }
+        var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
+
+        return await JsonSerializer.DeserializeAsync<T>(stream, cancellationToken: cancellationToken);
+
     }
 
     public async Task<GitHubRelease?> GetLastReleaseAsync(Uri? uriRepository = null, CancellationToken cancellationToken = default)
     {
-        if (uriRepository == null) {
-            if (_httpClient.BaseAddress == null) {
-                throw new NullReferenceException("No base address for HttpClient");
-            }
-            uriRepository = _httpClient.BaseAddress;
+        uriRepository ??= _httpClient.BaseAddress ?? throw new NullReferenceException("No base address for HttpClient");
+
+        var response = await _httpClient.GetAsync(new Uri(uriRepository, "releases/latest"), cancellationToken);
+        if (!response.IsSuccessStatusCode) {
+            _logger?.LogError("Failed to get last release from {UriRepository}. Status code: {StatusCode}", uriRepository,
+                response.StatusCode);
+            return null;
         }
 
-        return await _httpClient.GetFromJsonAsync(new Uri(uriRepository, "releases/latest"),
-            SourceGenerationContext.Default.GitHubRelease, cancellationToken: cancellationToken);
+        return await response.Content.ReadFromJsonAsync<GitHubRelease>(cancellationToken: cancellationToken);
     }
 
     public async Task<GitHubRelease?> GetReleaseAsync(string tag, Uri? uriRepository = null, CancellationToken cancellationToken = default)
     {
-        if (uriRepository == null) {
-            if (_httpClient.BaseAddress == null) {
-                throw new NullReferenceException("No base address for HttpClient");
-            }
-            uriRepository = _httpClient.BaseAddress;
+        uriRepository ??= _httpClient.BaseAddress ?? throw new NullReferenceException("No base address for HttpClient");
+
+        var response = await _httpClient.GetAsync(new Uri(uriRepository, $"releases"), cancellationToken);
+        if (!response.IsSuccessStatusCode) {
+            _logger?.LogError("Failed to get releases from {UriRepository}. Status code: {StatusCode}", uriRepository,
+                response.StatusCode);
+            return null;
         }
 
-        var json = await _httpClient.GetFromJsonAsync(new Uri(uriRepository, $"releases"),
-            SourceGenerationContext.Default.GitHubReleaseArray, cancellationToken: cancellationToken);
-        return json?.FirstOrDefault(t => t.TagName.Equals(tag));
+        var releases = await response.Content.ReadFromJsonAsync<List<GitHubRelease>>(cancellationToken: cancellationToken);
+
+        return releases?.FirstOrDefault(t => t.TagName.Equals(tag));
     }
 
     public async Task<IEnumerable<Tag?>?> GetTagsAsync(Uri? uriRepository = null, CancellationToken cancellationToken = default)
     {
-        if (uriRepository == null) {
-            if (_httpClient.BaseAddress == null) {
-                throw new NullReferenceException("No base address for HttpClient");
-            }
-            uriRepository = _httpClient.BaseAddress;
-        }
+        uriRepository ??= _httpClient.BaseAddress ?? throw new NullReferenceException("No base address for HttpClient");
+        var response = await _httpClient.GetAsync(new Uri(uriRepository, "tags"), cancellationToken);
 
-        await using var tagsStream = await _httpClient.GetStreamAsync(new Uri(uriRepository, "tags"), cancellationToken);
-        var tags = await JsonSerializer.DeserializeAsync(tagsStream,
-            SourceGenerationContext.Default.IEnumerableTag, cancellationToken: cancellationToken);
+        if (!response.IsSuccessStatusCode) {
+            _logger?.LogError("Failed to get tags from {UriRepository}. Status code: {StatusCode}",
+               uriRepository, response.StatusCode);
+            return default;
+        }
+        var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
+        var tags = await JsonSerializer.DeserializeAsync<IEnumerable<Tag?>?>(stream, cancellationToken: cancellationToken);
 
         if (tags is not null) {
             return tags;
diff --git a/src/ImeSense.Launchers.Belarus/ViewModels/DownloadMenuViewModel.cs b/src/ImeSense.Launchers.Belarus/ViewModels/DownloadMenuViewModel.cs
index 1c5da3b..617bdd1 100644
--- a/src/ImeSense.Launchers.Belarus/ViewModels/DownloadMenuViewModel.cs
+++ b/src/ImeSense.Launchers.Belarus/ViewModels/DownloadMenuViewModel.cs
@@ -125,7 +125,7 @@ private async Task DownloadsImplAsync(LauncherViewModel launcherViewModel)
             return;
         }
 
-        if (filesDownload != null && filesDownload.Any()) {
+        if (filesDownload is not null && filesDownload.Any()) {
             var countFiles = filesDownload.Count;
             var numberFile = 0;
             IsDownload = true;
diff --git a/src/ImeSense.Launchers.Belarus/ViewModels/LinkViewModel.cs b/src/ImeSense.Launchers.Belarus/ViewModels/LinkViewModel.cs
index f335e02..c3d0447 100644
--- a/src/ImeSense.Launchers.Belarus/ViewModels/LinkViewModel.cs
+++ b/src/ImeSense.Launchers.Belarus/ViewModels/LinkViewModel.cs
@@ -50,7 +50,7 @@ public LinkViewModel()
 
     private void Init()
     {
-        if (_launcherStorage.WebResources != null) {
+        if (_launcherStorage.WebResources is not null) {
             _logger?.LogInformation("Web resources are initialized");
             WebResources.AddRange(_launcherStorage.WebResources);
         } else {
diff --git a/src/ImeSense.Launchers.Belarus/ViewModels/Validators/AuthenticationViewModelValidator.cs b/src/ImeSense.Launchers.Belarus/ViewModels/Validators/AuthenticationViewModelValidator.cs
index 9587b11..5896e15 100644
--- a/src/ImeSense.Launchers.Belarus/ViewModels/Validators/AuthenticationViewModelValidator.cs
+++ b/src/ImeSense.Launchers.Belarus/ViewModels/Validators/AuthenticationViewModelValidator.cs
@@ -14,21 +14,21 @@ public sealed class AuthenticationViewModelValidator(IAuthenticationValidator va
     public ValidationHelper EnsureUsernameNotEmpty(AuthorizationViewModel authorizationViewModel)
     {
         return authorizationViewModel.ValidationRule(viewModel => viewModel.Username,
-            username => username != null && _validator.IsUsernameNotEmpty(username),
+            username => username is not null && _validator.IsUsernameNotEmpty(username),
             _localeManager.GetStringByKey("LocalizedStrings.EnterNickName"));
     }
 
     public ValidationHelper EnsureUsernameCorrectLength(AuthorizationViewModel authorizationViewModel)
     {
         return authorizationViewModel.ValidationRule(viewModel => viewModel.Username,
-            username => username != null && _validator.IsUsernameCorrectLength(username),
+            username => username is not null && _validator.IsUsernameCorrectLength(username),
             _localeManager.GetStringByKey("LocalizedStrings.TooLongNickname"));
     }
 
     public ValidationHelper EnsureUsernameCorrectCharacters(AuthorizationViewModel authorizationViewModel)
     {
         return authorizationViewModel.ValidationRule(viewModel => viewModel.Username,
-            username => username != null && _validator.IsUsernameCorrectCharacters(username),
+            username => username is not null && _validator.IsUsernameCorrectCharacters(username),
             _localeManager.GetStringByKey("LocalizedStrings.InvalidCharacters"));
     }
 }
diff --git a/src/ImeSense.Launchers.Belarus/ViewModels/Validators/StartGameViewModelValidator.cs b/src/ImeSense.Launchers.Belarus/ViewModels/Validators/StartGameViewModelValidator.cs
index 4a509fe..a341866 100644
--- a/src/ImeSense.Launchers.Belarus/ViewModels/Validators/StartGameViewModelValidator.cs
+++ b/src/ImeSense.Launchers.Belarus/ViewModels/Validators/StartGameViewModelValidator.cs
@@ -15,14 +15,14 @@ public ValidationHelper EnsureIpAddressNotEmpty(StartGameViewModel startGameView
     {
 
         return startGameViewModel.ValidationRule(viewModel => viewModel.IpAddress,
-            serverAddress => serverAddress != null && _validator.IsIpAddressNotEmpty(serverAddress),
+            serverAddress => serverAddress is not null && _validator.IsIpAddressNotEmpty(serverAddress),
             _localeManager.GetStringByKey("LocalizedStrings.IpAddressNotEntered"));
     }
 
     public ValidationHelper EnsureValidIpAddressOrUrl(StartGameViewModel startGameViewModel)
     {
         return startGameViewModel.ValidationRule(viewModel => viewModel.IpAddress,
-                serverAddress => serverAddress != null && _validator.IsValidIpAddressOrUrl(serverAddress),
+                serverAddress => serverAddress is not null && _validator.IsValidIpAddressOrUrl(serverAddress),
                 _localeManager.GetStringByKey("LocalizedStrings.InvalidIpAddress"));
     }
 }