It appears that when you upgraded, it only gave you a professional license. I suggest you contact NCH about the problem.
The problem is NCH's current policy generally refuses refunds in the event that:
- The software has already been activated
- A mistake was made during order/upgrade process (e.g. selected wrong license)
If in fact it was a case of accidentally selecting to upgrade to the professional license instead of the enterprise license, you may be unable to obtain a refund. However, I think they may let you pay the difference in price and upgrade to the Enterprise license to fix the situation. Of course if it's there mistake, I'm sure they'll help rectify the situation as soon as possible.