diff --git a/configure.php b/configure.php
index 9926156ae..35b34eba4 100755
--- a/configure.php
+++ b/configure.php
@@ -635,8 +635,6 @@ function getFileModificationHistory(): array {
 // Notice how doing it this way results in generating less than half as many files.
 $infiles = array(
     'manual.xml.in',
-    'install-unix.xml.in',
-    'install-win.xml.in',
     'scripts/file-entities.php.in',
 );
 
diff --git a/install-unix.xml.in b/install-unix.xml.in
deleted file mode 100644
index a445d072b..000000000
--- a/install-unix.xml.in
+++ /dev/null
@@ -1,40 +0,0 @@
-<?xml version='1.0' encoding='UTF-8' ?>
-<!DOCTYPE PHPDOC [
-
-<!ENTITY % language-defs     SYSTEM "../@LANGDIR@/language-defs.ent">
-<!ENTITY % language-snippets SYSTEM "../@LANGDIR@/language-snippets.ent">
-
-%language-defs;
-%language-snippets;
-
-<!-- All global entities for the XML files -->
-<!ENTITY % global.entities  SYSTEM "./entities/global.ent">
-
-<!-- These are language independent -->
-<!ENTITY % build.version    SYSTEM "./entities/version.ent">
-<!ENTITY % global.file-entities  SYSTEM "./entities/file-entities.ent">
-
-%global.entities;
-%global.file-entities;
-%build.version;
-
-]>
-
-<book xmlns="http://docbook.org/ns/docbook" version="5.2" xml:id="install" xml:lang="en" xmlns:xlink="http://www.w3.org/1999/xlink">
- <title>Installing PHP</title>
- <preface>
-  <title>Preface</title>
-  <para>
-   These installation instructions were generated from the HTML version of
-   the PHP Manual so formatting and linking have been altered. See the
-   online and updated version at: http://php.net/install.unix
-  </para>
- </preface>
-  &install.intro;
-  &install.unix.index;
-  &install.macos.index;
-  &install.pecl;
-  &install.problems;
-  &install.ini;
-  &faq.installation;
-</book>
diff --git a/install-win.xml.in b/install-win.xml.in
deleted file mode 100644
index 5d5d362d1..000000000
--- a/install-win.xml.in
+++ /dev/null
@@ -1,95 +0,0 @@
-<?xml version='1.0' encoding='UTF-8' ?>
-<!DOCTYPE PHPDOC [
-
-<!ENTITY % language-defs     SYSTEM "../@LANGDIR@/language-defs.ent">
-<!ENTITY % language-snippets SYSTEM "../@LANGDIR@/language-snippets.ent">
-
-%language-defs;
-%language-snippets;
-
-<!-- All global entities for the XML files -->
-<!ENTITY % global.entities  SYSTEM "./entities/global.ent">
-
-<!-- These are language independent -->
-<!ENTITY % build.version    SYSTEM "./entities/version.ent">
-<!ENTITY % global.file-entities  SYSTEM "./entities/file-entities.ent">
-
-%global.entities;
-%global.file-entities;
-%build.version;
-
-]>
-
-
-<!-- you should remove the &install.windows.legacy.building; entity from the
-     en/install/windows/index.xml file to build this file -->
-
-
-<book xmlns="http://docbook.org/ns/docbook" version="5.2" xml:id="install" xml:lang="en">
-<title>Installation on Windows systems</title>
-  <para>
-  Installing PHP on modern Microsoft Windows systems and recommended configuration with common web servers.
-  </para>
-  <note>
-  <para>
-
-If you are looking for information about older systems, such as Windows XP, 2003, 98 or Apache 1.x, see the <link linkend="install.windows.legacy.index">Legacy Info</link> section.
-</para>
-</note>
-<para>
-The Official releases of PHP on Windows are recommended for production use.
-However, you are welcome to build PHP from Source. You will need a Visual Studio environment. See <link xlink:href="https://wiki.php.net/internals/windows/stepbystepbuild">Step by Step Build Instructions</link>.
-</para>
-
-
-<!---
-<link linkend="install.windows.legacy.commandline">Using PHP on Windows Command line</link>
-<link linkend="install.windows.tools">Install Tools</link>
-<link linkend="install.windows.manual">Manual Installation</link>
-
-<link linkend="install.cloud.azure">Installing PHP on Azure App Services</link> (aka Microsoft Azure, Windows Azure, or (Windows) Azure Web Apps).
--->
-
-<!--
-<sect1>
-  <title>Install Requirements</title>
-
-<para>PHP 5.5+ require at least Windows 2008/Vista, or 2008r2, 2012, 2012r2, 2016 or 7, 8, 8.1, 10. Either 32-Bit or 64-bit (aka X86 or X64. PHP does not run on Windows RT/WOA/ARM).</para>
-
-<para>PHP requires the Visual C runtime(CRT). Many applications require that so it may already be installed.
-
-PHP 5.4, 5.5, 5.6 requires VC CRT 11 (Visual Studio 2012). See: <link xlink:href="https://www.microsoft.com/en-us/download/details.aspx?id=30679">https://www.microsoft.com/en-us/download/details.aspx?id=30679</link>
-
-PHP 7.0+ requires VC CRT 14 (Visual Studio 2015). See: <link xlink:href="https://www.microsoft.com/en-us/download/details.aspx?id=48145">https://www.microsoft.com/en-us/download/details.aspx?id=48145</link>
-
-You MUST download the x86 CRT for PHP x86 builds and the x64 CRT for PHP x64 builds.
-
-If CRT is already installed, the installer will tell you that and not change anything.
-
-The CRT installer supports the /quiet and /norestart command-line switches, so you can script running it.
-
-VC11 CRT DLLs can be copied from your local machine to a remote machine(`Copy Deployment` installation) instead of running the installer on the remote machine (such as a web server you have restricted access to). See: http://www.sitepoint.com/install-php53-windows/
-
-VC14 CRT does not support a `Copy Deployment` installation. VC14 CRT has many more DLLs(most in files with names starting with api-*). If you can find them all and copy them, it will also work (try a tool like Resource Hacker to get a list of all the DLLs to copy).
-
-</para>
-
-</sect1>
--->
-<!--
-<link linkend="install.windows.recommended">Recommended Configuration</link>
--->
-<!--<sect1>
-  <title>PECL</title>
-
-<para>PECL extensions are pre-built for Windows and available from: <link xlink:href="http://windows.php.net/downloads/pecl/releases/">http://windows.php.net/downloads/pecl/releases/</link>
-</para>
-
-</sect1>
-
-  <para>Some extensions use features specific to some Unix systems and so are not available on Windows. Otherwise, all extensions are available for Windows.</para>
-  -->
-  <!--
-  <link linkend="install.windows.troubleshooting">Troubleshooting Common Problems</link>
-  -->
-</book>