I remember having to enter this info on the openssl heartbleed patches which didn't even change the version number so this doesn't surprise me at all.
If I am not mistaken, it is a major upgrade. You will need to have all credentials ready.
Don't forget to read the known issues before you upgrade: McAfee KnowledgeBase - ePolicy Orchestrator 5.1.1 Known Issues
Thanks, I did the upgrade with no issues, just had to have the credentials