I think you just re-installed the sim. Did you check whether the repository paths were the same? Since you ran it as admin, I assume it is now in a different localapp folder.
I might be wrong, but I bet when you restart it will ask for an update again.
did you find a solution to this problem? I have the exact same problem.
it seems it downloaded the file, then can’t decompress and start dowloading again, in a infinite loop