Mac content problems with gmod

So I play gmod on a mac (not ideal, I know) and recently I’ve been having issues with fastdl, namely that it doesn’t work at all. I’ve been trying to join one TTT server in particular (Questionable Ethics, idk if that’s relevant) and it has a bunch of custom content that isn’t on the workshop or external sites like maps, models etc. So because fastdl isn’t working correctly, I can’t download this content at all. I don’t know if this problem is happening because it’s the OSX version of gmod, but I’m hoping there’s some solution to be found here.