Yes, I read that too and it was one of the things I eventually did. Now the ActiveHome Pro folder is at C:\.
The order of doing things is also important. This point was driven home for me when I finally got my Windows 10 machine to to recognize the CM15A interface. The very last thing I did before it worked was plugging in the USB cable. Rather than intentional, this was by accident.
I had been trying to make it work on my Win 7 machine without success. Then I switched back to the Win 10 machine, uninstalled AHP, and reinstalled it at C:\. It still didn't recognize the interface. Then I realized I had forgotten to switch the cable back to the Win 10 machine. When I plugged it in, the Interface was recognized! This should be no surprise, since the the CM15A instructions says to install the AHP software before plugging in the interface.