While the themselves are completely free and open-source, the base game (Silent Hill 2) is copyrighted material owned by Konami. To stay safe and support the creators, ensure you are downloading the enhancement tools from the official Town of Silent Hill project site to avoid malware often found on unofficial "free download" mirrors.
Native support for modern gamepads (Xbox, DualShock, DualSense) with correct button prompts. How to Get Started silent-hill-2-enhanced-edition-free-download
You must have the original Silent Hill 2 (PC) installed on your computer. Note that this version is no longer sold digitally, so you will need a physical copy or a pre-existing installation. While the themselves are completely free and open-source,