Upgrading from Trial Version to Student Version

I’m trying to upgrade my trial version of Rhino 5 to a student version, and my credit card has been charged, I have my new license key, but now it wants a license key for my previous version of Rhino. Do I have one for my trial version? I don’t know where to find it.

An evaluation version can be converted to a licensed version with a license key.
It sounds like you purchased an upgrade license as if you were trading in an older V4 version for the upgrade.
Please call Sales at 206.545.7000 to solve this.