Backup Exec 2012 trial licence bug.

Hi, I have Symantec Backup Exec 2012 (trial) on my Windows Server and since my trial has expired I can't do any of my backups anymore... I bought some licence but they won't install : (Maintenance) Library Expansion, (Maintenance) Entreprise Server, (Maintenance) Backup Exec 2012, (Maintenance) Agent for Windows.

I also have older licence that aren't (Maintenance)

My question is if I install the new licence do I lose my backup configuration or it is transparent?

Also, whats the difference between a Maintenance and a normal Licence.

Thank you