Posting here as another source of potential help. (I've looked online for an answer, and also sent an email to twitch support) I've updated my modpack (same process that I've been following for weeks), but it's been reported to me that it doesn't install, with an error of "Failed to get mod loader from manifest". I've tried installing myself, and get the same error. Has anyone else encountered this and know of a solution? Sounds like a twitch issue to me.