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How to play on the latest version of macOS (Catalina 10.15)


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The latest version of macOS no longer supports 32 bit applications such as Garry's Mod.

If you don't have the latest version of macOS you may consider doing this anyway simply because it's (seemingly) more stable. If it's not reverting is self explanatory.

In order to play you'll need to do the following:


In your steam library right click Garry's Mod and select "properties" while the game is closed.



Select the "betas" tab then select the 64 bit option shown below.


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