you should also know that there is no difference in upgrade and full version disc. only the installer program acts differently depending on what serial number is entered. With the upgrade serial number the installer looks for perviously installed software, if it doesn’t find it it ask for the previous serial number and does a full install. Academic and NFR serial numbers (and that is the only difference) just will not give you a valid upgrade path. And this is only to limit the life of academic versions not to limit the program in any way.
While I do not have Academic versions I did Upgrade three systems to FCS (2) as new installs and (1) as an upgrade, both ways work fine.
When you install your FCS2 it will only ask for the new serial number and it would install FCS and remove FCS1 (or whatever version you have).