Check your license in the VMWare Fusion -> License menu. It will most likely have picked up your Standard license.
You should be able to temporarily move the license file located in
/Library/Preferences/VMWare Fusion/license-fusion-<xxx>
to another directory in order to start your Pro Evaluation. Make sure to either close VMWare Fusion before you move the file, or completely uninstall it if just closing does not work for you
Regards