Same problem. ModFactor connected via usb, shows connected in computer but H9 says "0 Eventide products returned" after searching. tried everything in forums without success. Please help.
In the H9 Control manual there's a section on trouble shooting USB connections to Windows computers. Please take a look at that section. The H9 Control manual is bundled into H9 Control, and can be found under Settings / Help. But you can also read it online here:
The relevant section begins on page 12.