If you are looking for the most stable and feature-complete experience, it is recommended to use the official Steam version, which provides access to the Steam Workshop for millions of free addons. Valve Developer Community in Garry's Mod or installing a particular mod from the Workshop? Changes - Garry's Mod - facepunch
If you already own GMod, just verify your Steam files. If you don’t, wishlist it on sale instead of risking shady downloads. If you are looking for the most stable
Be Careful with “Garry’s Mod v161201 Full Autoupdate Multilanguage” Claims If you don’t, wishlist it on sale instead
Some developers and archivists keep old GMod builds for historical research or legacy addon support. These are , but you can find discussions about them on: However, if you only play the newest gamemodes
Execute the setup file and choose your preferred installation directory.
However, if you only play the newest gamemodes (like the 2025 versions of Prop Hunt) or want official Linux dedicated server support, you should stick to the Steam main branch.