Oh my.... You are right. I created a monster.

It's so dumb >_< Dumber than trying to speedrun this game on mac !

It would be a pleasure ! Even tough, it seems that this workaround is what darkid downpatcher acheive. But manually. I did not try the downpatcher.

Hi! I'm new to speedrunning, and I intend to do a run on Mac for this game (Greatest of All Time). btw : darkid, you are my hero.

As some may know, since macOS 10.15 Catalina, MacOS can only run 64-bit apps. The speedrun-244371 version is 32-bits and seemed unplayable so far on OSX. Croteam released a 64-bit version of the game (legacyosx in the beta tab). This version poses challenges for speedrunning, especially for the 60FPS category, as some tricks I learned from @darkid's guide do not work on this version (RIP BLCJ and some cube stack tricks).

Guides on the internet would recommend either using Bootcamp or a virtual machine to run the game inside a Windows environment. It can be troublesome and a lengthy process (And... Some could say that's heresy to do so).

I tried something this afternoon, and it worked. Here are the steps to make it work:

1. Install Talos Principle from Steam.
2. In Steam, go to The Talos Principle "Settings -> Betas" tab and select the legacyosx version of the game. Wait for it to download and update the game files.
3. Go to the "/Users/[your username]/Library/Application Support/Steam/steamapps/common/The Talos Principle" folder. Copy the x64 folder to another location of your choice. 3*) If the Library folder is not visible, right-click inside your user folder and select "show presentation options" (I don't know if this option name is right; my OS is in French). Then click on "Show library folder." The folder should now be visible.
4. In Steam, go to The Talos Principle "Settings -> Betas" tab and select the speedrun-244371 version of the game. Wait for it to download and update the game files.
5. Copy the x64 folder you saved earlier from the location of your choice back to the "/Users/[your username]/Library/Application Support/Steam/steamapps/common/The Talos Principle" folder.

I tested this trick on every LTS version from 10.15 (Catalina) to 14.1.2 (Sonora 23B92) on an Intel Mac.

EDIT : Should I move this to the guide section ?