I could only do it in the files, the launcher won't start!
sorry i read it wrong.
to me it sounds like that windows defender or another (anti) virus tool does not let this process work. This may be due to the fact that you may have copied it once and it now looks "manipulated" for this software. but could also mean that an important directory/file is copy-protected or damaged.
but no idea if that's the case. You could try to turn off all antivirus software (including defender) for a short time, uninstall PR, restart (use ccleaner, restart), turn everything off again and then reinstall pr (maybe to another directory).
if you want to try installations of older versions let me know i have 1.5.0 with all updates on a google drive.