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ladymartti  This error is typically antivirus-related.  So please set exceptions in your antivirus for TS4_x64, TS4_DX9_x64, and TS4_Launcher_x64, or the entire Bin folder they're in.  You may also need to repair the game.

how would i do that (setting exceptions in the antivirus)?

bunni_b0o  That depends on what antivirus you use.  Here's an example for Avast/AVG:

https://crinrict.com/blog/2020/10/add-exceptions-to-anti-virus-programs.html#avast

Your particular AV should have documentation on its website about how to do this.  If you can't find any, let me know which program you use.