when i try to open the game it says "game is damaged and can't be opened". Is there a previous update of the game that works on mac?

This has come up before, usually with Strive: Conquest and seems to be related to Mac filtering out unauthorized software. Try this solution copied from a pinned post on the Strive Discord for Conquest:

When opening the new Mac version (0.5.5), an error reporting that the file is damaged and can't be opened occurs. This is a different error from the classic error of Mac preventing the opening of an app downloaded from outside the app store. The fix is to open terminal type:

xattr -cr /file/pathway/Strive-Conquest.app

Easiest way to do this is to just open terminal, type (without the quotes) "xattr -cr ", then drag the Strive-conquest application file from finder into terminal and it will create the file pathway for you. This should work without any more steps needed as it is kind of an all access pass for the file. WARNING: Whoever uses this method needs to make sure they only use it with trusted files (including mods downloaded later that will inherit the parent application's access) as it is essentially giving potentially embedded viruses the keys to the castle.

If still confused check this out: https://osxdaily.com/2019/02/13/fix-app-damaged-cant-be-opened-trash-error-mac/