To play GMod natively on macOS (including Intel and Apple Silicon like M1/M2/M3), you must use a specific 64-bit beta branch and a community-made patch. 1. Enable the 64-Bit Beta Branch
: Steam will automatically begin a small download to update your game files to the 64-bit version. 2. Apply the GMod CEF Codec Fix Gmod Install Mac Direct
: Double-click the file to open it. It will automatically patch your GMod installation files to support the modern macOS architecture. 3. Launching the Game To play GMod natively on macOS (including Intel
: Get the latest macOS version from the GModCEFCodecFix GitHub or use the simplified guide at Solstice Game Studios . Make Executable : Open your Terminal application. Type chmod +x (with a space at the end). Gmod Install Mac Direct
Once the patch is applied, you can launch Garry's Mod. On Apple Silicon Macs, the game will run via with surprisingly high performance, often maintaining 60+ FPS even with numerous addons. Requirement Minimum Spec OS macOS 10.15 (Catalina) or later (required for 64-bit) Processor Intel Core 2 Duo or Apple Silicon (M1/M2/M3) RAM 4 GB (8 GB recommended) Storage 5 GB for base game; 20+ GB recommended for addons Save 50% on Garry's Mod on Steam
Installing Garry’s Mod (GMod) on a Mac involves more than just a simple click of the "Install" button. While Steam lists it as Mac-compatible, Apple's removal of 32-bit application support means the default version of GMod will not launch on modern macOS versions.