Click the button to open the client to let the download begin and wait for it to finish. Notification will pop and say “that our site wants to open this application”.Click the Download link below and you should already have installed a download client on your system.How to Download & Install Garry’s Mod Linux Game This modification was created to demonstrate the vast possibilities of the Source engine, which limits the freedom of players only by their own imagination. It is a physical “sandbox” that allows the player to manipulate objects and experiment with physics, the realism of which is provided by the Source engine. Garry’s Mod is a modification on the Half-Life 2 first-person shooter engine.