Hello Oliver,
try following:
1. Terminate the Embedded Wizard process if it still running
2. Start the Windows Registry Editor REGEDIT
3. In REGEDIT navigate to the key HKEY_CURRENT_USER\Software\TARA Systems\Embedded Wizard Studio.
4. Within this key delete the sub-key 8.20.
5. Start Embedded Wizard again.
If you are using the Evaluation Edition of Embedded Wizard the key is HKEY_CURRENT_USER\Software\TARA Systems\Embedded Wizard Studio Eval (with an additional Eval in its name).
Hope, it solves the problem.
Best regards
Paul Banach