Is there a fix for "unexpected error occured" installing expansions on the plus?

lordofgrug

I see the error posted on here many times, but no particular fix.

I've only managed to get one single expansion installed with dozens of attempts. While it fails during the download occasionally, most of the time download reaches 100%, then it tries to install for 5 mins, then the error message comes up

Yes, I've tried over wifi and lan

Yes I have plenty of space on the SD

Yes, if there are residual files left on the SD, I delete them manually before trying again, though most often there are none.

Pls, any advice would be helpful