I am trying to upgrade Sharepoint server 2007 (Enterprise CALs) to SP2010. I'm using the SP2010 evaluation package from Microsoft along with the included license keys.
When the upgrade process starts I'm prompted for the licence key, I paste it in, the key gets validated fine. However, on the next screen of the upgrade wizard I get an error message: "A previous installation has been detected with a license type does not match the install in progress".
I can't proceed past this point. I've googled the error but there is not much out there.