First, I made back up of photos, etc...
I tried the first time, from Update and Security... That went total to the floor! WAY too fast, and even though, it looked like, had upgraded to version 21H1, the upgrade wasn't installed.
I restored the computerto another restore point... Everything was fine after that, but the upgrade still showed up in Update and Security. But nothing happened when clicking on it.
So, I decided to reset it, by removing all on the computer. And I was back on 20H2... I then found the link: https://www.microsoft.com/en-us/software-download/windows10 here in the forum, and that worked - I remembered to deactivate my antivirus program. Perhaps, that was the problem before....... (And later realized, when using 3 parts antivirus, I also have to deactivate Windows Defender.....) :-D
So, after checking for updates, and installing them, the next hours was going with installing programs, and setting the computer as I want it, I at last was ready for using it normally!! Almost...... Because, I now can't set it to logon automaticcally, in the netplwiz. And can't find anything to do in gpedit.msc...
My netplwiz:

System specs:

And WOW! Nice, simply to insert pictures directly from the clipping board!!!