Gmod Addon Compiler throwing "Specified addon ID rejected" when updating as of ~3 days ago

The title basically sums up my problem, which is, as you can expect, very infuriating as it’s generally a pain in the rear to make new batch files every time I want to create or update an addon. I’ve tried serveral alternatives, none of which seem to work, even Garry’s Workshopper says “Cannot initialize Steam” (Even when it’s already running, or even ran through steam via a shortcut) At this point I’ve reinstalled it and restarted my computer about 4 times and basically speaking, this is generally a gigantic pain and any help I can get would be appreciated.

I would’ve left a comment on the actual thread for GAC, but, it was marked as closed.