Putting FCS 3 on a new MacBook Pro Retina

Hi all,

So I used to be a T3 (Apple trainer for FCS). In fact, Larry Jordan and I were in the same class one week about a million years ago! :-)
I've been asked to work on a project and I now have a MacBook Pro Retina w/ El Cap.

I've installed my old copy of FCS 2 (aka FCP 6) it's up and running on El Cap, YAY! And now I'm doing the upgrade to FCP3 (FCP7) and I'm stuck at the serial number page! I'm asked for the upgrade number which is on the installation booklet. I enter in all 33 numbers and hyphens and then it asks for the original number. I enter in the FCS2 number I just used to install FCP6 and it tells me it's the wrong number. I've check five times... it's correct! Am I missing something? Any thoughts? Are they talking about the serial number from an earlier version perhaps?

Thanks folks.

g