For what its worth, its only importing about 4 useful pages, the rest are blog pages and unfortunately our import tool is pretty limited and there's no way to bypass it importing blog pages. If you want, I can just transfer this import to you directly to prevent you from having to waste anymore time troubleshooting this. It could be a handful of things related to websockets or other connection issues.
Send me your Relume account email and I'll drop this project into your account.