Same problem here more or less, and I imagine will not be the last, especially as Windows 10 is free!
Upgraded from W7x64 to Windows 10x64 - Home edition
The application will start but when attempting to open the FTM file it crashes. Called support who suggested removing the link between app and website from the web interface, then go back to the application and re-download. Unfortunately this did not fix the issue.
Would rather not back out to Windows 7 but have 30 days grace (as per Microsoft upgrade process) to restore back to Windows 7, starting today.
Did try various Compatibility mode settings but all with the same outcome, oh and compacting the Database too.Nada.
FYI The Microsoft Compatibility web site states this version is NOT COMPATIBLE.