Hello,
Both Start10 and Start11 are compatible with Windows 10. However, development on Start10 has ceased since Stardock introduced Start11. For the best compatibility with current Windows 10 updates and features, Start11 is the recommended choice moving forward.
Also, Start11 can do what Start10 does. With lots more additional features and Menu Styles. No doubt Start11 do still have Windows 7 style start menu.
Thanks,
Basj,
Stardock Community Assistant.