Unreal, having already been delisted from Steam, is disappearing from GOG in just over two days. Right now, you can still purchase Unreal Gold, Unreal Tournament 2004 Editor’s Choice Edition, Unreal 2 ...

If you're completely new, I would suggest picking on a simple mod idea/goal that will teach you the basics. For example: learn how to extract game files, modify a texture/model and repackage it into a ...