[2020] Boostrapper ERROR HELP !!!!!!

We now have reports of this on AVG, Avast and possibly Kaspersky.

You need to make sure all these apps are in its exceptions lists:

dowser.exe (in the Steam Steallris folder)
C:/users//AppData/Local/Programs/Paradox Interactive/launcher-v2.2020.16/paradox launcher.exe
C:/users//AppData/Local/Programs/Paradox Interactive/bootstrapper-v2.exe

Good luck!  

That's because your antivirus app has quarantined it, and perhaps bootstrapper-v2.exe as well. You need to release them from quarantine and tell your AV app to leave them alone in future.