It looks like 2.2.2 is still available at
http://ota.versatilemonkey.com/beta, but I don't think much has changed between 2.2.2 and 2.5.0.
You can list your download settings here, but your best bet is to email a copy of your logs to Marcus (PT -> Menu -> Email developer, "Yes" when prompted to attach diagnostic logs)
Edit: Check to make sure OTA downloads are enabled. It may be that the setting isn't preserved when upgrading. Another user had a similar issue:
viewtopic.php?f=3&t=734