I’ve faced the same issue, download looping.
It happened right after the first 20Gb of data. When it reached the 170th remaining packages it began to loop.
The only solution i found was to pause, quit the game , kept opened the package folder and delete the file i could see on top of the list (sorted by date) ,each time it was failing
Back to the game and relaunching the download.
I did it between package 170 and 80 or so manually. It took me hours. after what it started to download the remaining packages without issue without an explanation of what was the cause of failures