Bear in mind that Garry’s Mod is not compatible with MacOS 10.15 Catalina. Still, it is a good idea to download Garry’s Mod on a computer that runs Windows 8 or 10, or the newest MacOS X/Ubuntu version if you’re a Unix OS user. Gmod is compatible with older versions of all operating systems, including Windows Vista and even XP.
A Garry’s Mod download requires at least 5GB of free disk space. A 2GHz processor is required to play G Mod, but the game can only achieve peak performance on a 2.5GHz or higher processor. In order to play the Garry’s Mod game, you need to have a computer with at least 4GB RAM and 512MB dedicated VRAM. Garry’s Mod started as a regular player’s mod of Half Life 2 and turned into a successful standalone game that thousands of people play on a regular basis. Of course, some mods do rely on a simple story to create a more compelling experience, but the core premise of Garry’s Mod is exploration.
Garry’s Mod is one of those rare games that have no storyline whatsoever. Garry’s Mod Review: Experiment, Explore, Enjoy