If I’m right, you’re describing a download loop. It’s not exactly unknown. The only thing you can do (assuming you’re on a PC) is close the program, get rid of the partial downloads in the Official folder, and start over. Here’s how…
Shut down the sim (duh…)
Open your Official\OneStore folder
Set the view type to Details, then click the Date Modified column header to sort by that. This should put the newest files at the top of the list - if not, click the header again to reverse the order.
You should see at least one file that’s not a folder, and has an odd filetype extension. Delete anything that’s not a folder.
Restart the sim and it should automatically restart the download/install process.
If it happens again, repeat the above steps. Albert Einstein (or Ben Franklin, depending on who you believe) once said “The definition of insanity is doing the same thing over and over and expecting different results.” Well, with patience, you will eventually prove yourself sane.