This is a web installer for Silent Hill 2: Enhanced Edition, originally created for learning purposes only, and later becoming an actual component of the project.
The source code is here for archival and reference purposes.
If you actually want to install SH2EE using this installer, download an official release from the SH2EE website instead.
References used when coding this installer:
How to add .arc decompression to Inno Setup?
How to execute 7zip without blocking the Inno Setup UI?
Embedded CMD in Inno Setup installer (show command output on a custom page)
Inno Setup by Jordan Russell.
Inno Download Plugin by Mitrich Software.
7-zip by Igor Pavlov.