License
I currently only own an upgrade serial, so use the v1.1 serial when asked by the installer in order to install v1.5. You do not need to install v1.1 first for this to work.

Final Cut Server 1.1 Retail (10 clients):
E-351-IPZ-389-GXR-401-NCH-507-MDS-TN5-Y4AX

Final Cut Server 1.5 Upgrade:
F-348-NAQ-466-NQC-213-REX-051-PJP-1GG-85BX