Yes it is, as I am having the same problem - was eligible for the Student/Teacher edition, now not and looking to upgrade to an Individual licence.
I talked to someone on Livechat yesterday about this and it ended with the person telling me if I called the sales number, rather than online, they would honour the upgrade.
When I called, the person on the phone said that this was not possible (and that there was no record of this commitment on my notes)...
It seems that there is no reward for loyalty or honesty... :-/