You need to post the backup zip file that you have downloaded or the email containing the link to the zip file. If your forum has been deleted unexpectedly then check your email provider's spam folder.
See the special area at:
http://support.nabble.com/Forum-Recovery-request-f7592522.htmlfor an indication of what's needed.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.