Hey, just FYI, there are some good solutions in this thread to get your problem fixed ASAP.
This one should work. https://news.ycombinator.com/item?id=19827302
This one should work. https://news.ycombinator.com/item?id=19827302
My reply is here https://news.ycombinator.com/item?id=19828472
This is much better than disabling the very same safe guard, signature checking, that prevents you from running arbitrary code in the first place.
But anyways, I'm not sure why, but the addons on my main computer remained enabled... unlike my 2 other computers.
AFAIK the reason the UI is scary is primarily because it is from an era when add-ons were much more dangerous, and when they were not required to be centrally signed. Neither is true anymore afaik.