In this particular instance/installation:
Unfortunately, my new version of Debian (Wheezy 64bit) and the old version of FOP2 (2.26) were not compatible.
So I had no chance of installing the older version, running the license, and then upgrading to 2.27.
I had upgraded my old Debian 6 (32 bit) to FOP2 (2.27) but the upgrade to 2.27 was not recognized on the new install.
If you have the same problem that I had, make sure you let Nicolas know of this particular problem, so he can get you up and running.
Thank you Nic for your help--again!