When both Toad for DB2 5.6 and 6.0 have been installed, the Migration Wizard can be re-initiated by closing Toad for DB2 6.0 and deleting the Application Data Directory named c:\Users\<Username>\AppData\Roaming\Quest Software\Toad for DB2 6.0
After deleting the directory and restarting, Toad for DB2 6.0 will provide the user prompt "Settings Migration Utility" at start up.
If Toad for DB2 5.6 has been UNINSTALLED, then this procedure does not work, even though the AppData directory for Toad for DB2 5.6 may technically still exist.