When I run the Sync and Convert Wizard, I receive this error: "Access violation at address 00E69325 in module 'TDM.exe'. Read of address ". I was able to run the wizard (to generate alter scripts) once successfully. Each subsequent run produces this error.
The problem is that there is one key with different name in the two models.
WORKAROUND:
Name the two keys to have the same name in both models and then generate alter script.
STATUS:
Waiting for fix to be released in a future version of Toad Data Modeler.