My understanding is that Curse is undergoing some maintenance right now. You can follow them on Discord for updates, but I think it explains the problems we're all having.
I am trying to install mods with CurseForge, but nothing seems to work. I tried to create a profile, but it gives me an Internal Server error. If I try Install "any" mod, nothing happens.
Also, I tried to Uninstall and Reinstall CurseForge, but that didn't work either. I have also tried running the app as an Administrator.