If you deleted the old backup thats all you can do i had to do the same.A game 'extension' that i use in gta is now coming up with this app cannot run under a virtual machine. I did have the sandbox feature turned on but have now turned it off.
And I ran disk cleanup the other day to free up some space and no longer have the previous update opps
Have I now gotta reinstall windows if I want to go back to the 1803 update?