Rogero 4.55 to Rebug 4.81

I've been trying to research this before I upgrade. I'm not sure of the answers yet...
1. Do i need to go back to Rogero 3.55 before upgrading to Rebug? Or can I upgrade from 4.55 to the latest rebug?
2. Will I need to upgrade anything else besides rebug before or after upgrading to rebug?