Due to unknown circumstances, 4.80 CFW is now required.
I believe this is an issue with some change on our web host's side, but I am not sure.
We suggest you update to Rebug 4.80, here. (As a reminder, you download a TXT file, the real download link is inside of it)
If your Blu-Ray Drive is broken, you can download a No-BD version here.
You may also need to update the launcher, here: http://savemgo.com/forums/viewtopic.php?f=11&t=3