I’ve been having the same issue. Tried to install ERA-R but when I enable and confirm is reverts back to he “new” state and doesn’t show up in the list. I’ve tried both 64 and 32bit and all the folders. Reinstalled both the plugin and audacity itself.
Their verification window never popped up but I figured that was due to the plugin never actually opening. I’m going to try to downgrade to 2.1.2 as the site said it was compatible with that version specifally. Thank you for the information though. I guess I’ll update if it works.