I believe that is correct - that functionality is not available, other than for users of Windows 10 Pro.
But, you should still have the Windows_Old folder - the Windows 10 upgrade process, if done with Upgrade In Place, would have saved off your prior Windows version, and I believe you have a 30-day windows to revert back to your older version of Windows.
Since your audio drivers for the audio interface seem to work in Windows 10, then I would suggest you go into Sonar Preferences, and see what is set for the audio interface device, as well as the Driver Mode, to make SURE those are set for your audio interface.
Lastly, if you have only your audio interface device present as an enabled device in Device Manager, if any other application, including Windows, is also attempting to use that audio interface, then Sonar might not have access to use the audio interface, since ASIO only lets one application get at control of the ASIO drivers.
(if your Windows theme has Windows Sounds turned on, they too might try to gain control of the ASIO drivers).
Bob Bone