I made the jump this morning to windows 10. The first attempt was excellent!!! Windows 7 to Windows 10 with 2 Studio-Captures and it never blinked!! Everything went great!
Then HOLY CRAP!!!!!!! I upgraded my 8.1 laptop and WHAT?? NO DRIVERS IN SONAR FOR STUDIO-CAPTURES!!!!!
After swearing and sweating for about an hour, I finally figured it out.
The old drivers for the Studios were blocking the new drivers for the Studio! They were both blocking Sonar from seeing ANY drivers! I un-installed the old drivers and the new ones appeared, ready to go. I just had to re-set the ASIO monitoring and the syncing of the 2 Studio-Captures and all was back to normal.
I don't know for sure but anyone with 2 SCs in sync may want to un-install the original drivers before you upgrade to windows 10 from 8.1. Your install may go smooth as silk.