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Does your Chromebook support Linux apps? Linux users usually run the launcher file which downloads neccessary files from newest version of the game automatically.

could you please show me or link a video on how to do so? I'm sorry I'm not a Linux expert

Maybe this link can help?
https://forum.unity.com/threads/how-to-running-game-on-linux.505705/

There should be a launcher file in the root folder that needs to be run.