I got the same problem (see link below of my report). Cursors “recommendation” of “just kill the running process” or “check your AV” isnt cutting it. Even uninstalling and installing a new version doesn’t solve the issue. There is a bigger issue with Win10/11 and cursor that the team needs to address asap.
It is getting very very frustrating and in fact a thread to my business. I think I am not alone when I say “ i am considering alternative tools and leave Cursor”
My report: Installing Cursor Update Fails on Windows - #2 by danperks