Step-by-step Guide to setting up GMod CEF Codec Fix on macOS Note: Garry's Mod must be closed before following this guide. If you are already on the [x86-64] branch, skip to step 5! Other tutorials: Windows | Linux 1. Open Steam, then right click Garry's Mod from your Library games list. Select Properties from the menu. 2. In the properties window, switch to the "Betas" tab. 3. From the Betas tab, click on the Dropdown menu and select "x86-64 - Chromium + 64-bit Binaries" 4. Now you can close the properties window and wait for the update to download. 5. When the update is finished downloading, go to the Releases tab on GMod CEF Codec Fix Github page. 6. From that page, under Assets, click the appropriate package for your operating system to download the script. Use the version closest to the top of the page, that's the newest one! 7. Open Terminal from Applications ▸ Utilities or using Spotlight, then type the command Code: chmod +x and drag the file you downloaded onto the Terminal window. Press Enter to run the command. This makes the Codec Fix executable. You will notice the icon for the GModCEFCodecFix file change if you've done this correctly. 8. Double click the GModCEFCodecFix file in Finder. When the script runs, it will say what it is doing. If the files are not patched yet, the patches will download. Depending on your internet speed, this step can take a moment. 9. When finished, you can launch GMod from the GModCEFCodecFix window by typing "y" and pressing Enter. If you do not wish to run GMod now, type "n" and press Enter. Congratulations! If you made it this far, you're done. Luckily the script does pretty much all of the work for us this time. To avoid the file patches reverting to the files included with GMod, be sure to use the GModCEFCodecFix script to launch GMod, or launch GMod via your games list. Using most methods of game launching on Steam forces a file validation pass which will revert these patches. You'll have to run the script again to re-patch the files if you do this.