Due to the ongoing purge, I copied my installed addons from the workshop/content/4000 folder and grabbed a couple with a workshop download site, but I'm not sure how to get them to be recognized by Extended Spawnmenu, especially since most of them are .bin files.
I don't think there's any problems with the addons themselves. For one of the ones I downloaded from the site, I followed a different tutorial that involved putting the assets directly into GMod's base assets after doing some extraction stuff with GWTool and Gmad, and they came through alright, but I had to use the search tool to find them. I'd prefer to have a folder that I can see the contents of an addon in, which Extended Spawnmenu looks to provide. I just can't really get it to work.