Hello johnsoderberg,
Good day! I'm John Dev a Windows user like you and I'll be happy to assist you today. I know this has been difficult for you, Rest assured, I'm going to do my best to help you.
Interrupting the upgrade process can cause your system to become unstable and not work properly. I recommend waiting for it to finish and check Kapil Arya’s guide below on How to Downgrade from Windows 11 to 10.
https://answers.microsoft.com/en-us/windows/for...
Kindly let me know if this helps or if you have any further concerns.
Kind regards,
John DeV
Independent Advisor