check if wsappx is working in task manager.
it often detects the files being corrupt because sega s stupid launcher is used and not the windows store for the update. so windows thinks oh crap data corrupt or an evil cheating attempt.
i was only able to play with this.
delete pso. wait till wsappx wont be active anymore in task manager.
install pso. dont press start.
use the custom launcher pso2 tweaker. google for it or click https://na.arks-layer.com/
click update. it will update the 90k files and download around 70gb
only use the tweaker. never the sega launcher. you have to install the app in the ms store before using the tweaker otherwise it wont work.