diff --git a/ccptinstall.lua b/ccptinstall.lua
index c8429de..61ee334 100644
--- a/ccptinstall.lua
+++ b/ccptinstall.lua
@@ -6,29 +6,15 @@
 ]]
 
 -- Read arguments
-args = {...}
+local args = {...}
 
 -- FILE MANIPULATION FUNCTIONS --
---[[ Checks if file exists
-	@param String filepath: Filepath to check
-	@return boolean: Does the file exist?
---]]
-function file_exists(filepath)
-	local f=io.open(filepath,"r")
-	if f~=nil then 
-		io.close(f) 
-		return true 
-	else 
-		return false 
-	end
-end
-
 --[[ Stores a file in a desired location
 	@param String filepath: Filepath where to create file (if file already exists, it gets overwritten)
 	@param String content: Content to store in file
 --]]
-function storeFile(filepath,content)
-	writefile = fs.open(filepath,"w")
+local function storeFile(filepath,content)
+	local writefile = fs.open(filepath,"w")
 	writefile.write(content)
 	writefile.close()
 end
@@ -38,9 +24,9 @@ end
 	@param String createnew: (Optional) Content to store in new file and return if file does not exist. Can be nil.
 	@return String|boolean content|error: Content of the file; If createnew is nil and file doesn't exist boolean false is returned
 --]]
-function readFile(filepath,createnew)
-	readfile = fs.open(filepath,"r")
-	if readfile == nil then
+local function readFile(filepath,createnew)
+	local readfile = fs.open(filepath,"r")
+	if not readfile then
 		if not (createnew==nil) then
 			storeFile(filepath,createnew)
 			return createnew
@@ -48,7 +34,7 @@ function readFile(filepath,createnew)
 			return false
 		end
 	end
-	content = readfile.readAll()
+	local content = readfile.readAll()
 	readfile.close()
 	return content
 end
@@ -57,7 +43,7 @@ end
 	@param String filepath: Filepath where to create file (if file already exists, it gets overwritten)
 	@param Table data: Table to store in file
 --]]
-function storeData(filepath,data)
+local function storeData(filepath,data)
 	storeFile(filepath,textutils.serialize(data):gsub("\n",""))
 end
 
@@ -66,7 +52,7 @@ end
 	@param boolean createnew: If true, an empty table is stored in new file and returned if file does not exist.
 	@return Table|boolean content|error: Table thats stored in the file; If createnew is false and file doesn't exist boolean false is returned
 --]]
-function readData(filepath,createnew)
+local function readData(filepath,createnew)
 	if createnew then
 		return textutils.unserialize(readFile(filepath,textutils.serialize({}):gsub("\n","")))
 	else
@@ -79,14 +65,14 @@ end
 	@param String url: The desired URL
 	@return Table|boolean result|error: The result of the request; If the URL is not reachable, an error is printed in the terminal and boolean false is returned
 --]]
-function gethttpresult(url)
+local function gethttpresult(url)
 	if not http.checkURL(url) then
 		print("ERROR: Url '" .. url .. "' is blocked in config. Unable to fetch data.")
 		return false
 	end
-	result = http.get(url)
-	if result == nil then
-		print("ERROR: Unable to reach '" .. url .. "'")
+	local result,err = http.get(url)
+	if not result then
+		print("ERROR: Unable to reach '" .. url .. "' because '" .. err .. "'")
 		return false
 	end
 	return result
@@ -97,12 +83,13 @@ end
 	@param String url: The desired URL
 	@return nil|boolean nil|error: nil; If the URL is not reachable, an error is printed in the terminal and boolean false is returned
 --]]
-function downloadfile(filepath,url)
-	result = gethttpresult(url)
-	if result == false then 
+local function downloadfile(filepath,url)
+	local result = gethttpresult(url)
+	if not result then 
 		return false
 	end
 	storeFile(filepath,result.readAll())
+	return true
 end
 
 -- MISC HELPER FUNCTIONS --
@@ -111,7 +98,7 @@ end
 	@param String needle: String to check wether another one starts with it
 	@return boolean result: Wether the firest String starts with the second one
 ]]--
-function startsWith(haystack,needle)
+local function startsWith(haystack,needle)
 	return string.sub(haystack,1,string.len(needle))==needle
 end
 
@@ -120,19 +107,19 @@ if (args[1]=="install") or (args[1]==nil) then
 	print("[Installer] Well, hello there!")
 	print("[Installer] Thank you for downloading the ComputerCraft Package Tool! Installing...")
 	print("[Installer] Installing 'properprint' library...")
-	if downloadfile("lib/properprint","https://raw.githubusercontent.com/PentagonLP/properprint/main/properprint")== false then
+	if not downloadfile("lib/properprint","https://raw.githubusercontent.com/PentagonLP/properprint/main/properprint") then
 		return false
 	end
 	print("[Installer] Successfully installed 'properprint'!")
 	print("[Installer] Installing 'ccpt'...")
-	if downloadfile("ccpt","https://raw.githubusercontent.com/PentagonLP/ccpt/main/ccpt")==false then
+	if not downloadfile("ccpt","https://raw.githubusercontent.com/PentagonLP/ccpt/main/ccpt") then
 		return false
 	end
 	print("[Installer] Successfully installed 'ccpt'!")
 	print("[Installer] Running 'ccpt update'...")
 	shell.run("ccpt","update")
 	print("[Installer] Reading package data...")
-	packagedata = readData("/.ccpt/packagedata")
+	local packagedata = readData("/.ccpt/packagedata")
 	print("[Installer] Storing installed packages...")
 	storeData("/.ccpt/installedpackages",{
 		ccpt = packagedata["ccpt"]["newestversion"],
@@ -141,7 +128,7 @@ if (args[1]=="install") or (args[1]==nil) then
 	print("[Installer] 'ccpt' successfully installed!")
 elseif args[1]=="update" then
 	print("[Installer] Updating 'ccpt'...")
-	if downloadfile("ccpt","https://raw.githubusercontent.com/PentagonLP/ccpt/main/ccpt")==false then
+	if not downloadfile("ccpt","https://raw.githubusercontent.com/PentagonLP/ccpt/main/ccpt") then
 		return false
 	end
 elseif args[1]=="remove" then
@@ -149,12 +136,12 @@ elseif args[1]=="remove" then
 	fs.delete("/ccpt")
 	fs.delete("/.ccpt")
 	shell.setCompletionFunction("ccpt", nil)
-	if file_exists("startup") and startsWith(startup,"-- ccpt: Seach for updates\nshell.run(\"ccpt\",\"startup\")") then
+	if fs.exists("startup") and startsWith(startup,"-- ccpt: Seach for updates\nshell.run(\"ccpt\",\"startup\")") then
 		print("[Installer] Removing 'ccpt' from startup...")
-		startup = readFile("startup","")
+		local startup = readFile("startup","")
 		storeFile("startup",string.sub(startup,56))
 	end
 	print("[Installer] So long, and thanks for all the fish!")
 else
 	print("[Installer] Invalid argument: " .. args[1])
-end
\ No newline at end of file
+end