Why are you using the Windows 7 version and not 8 for your Windows 10 OS?
Consider yourself fortunate your firmware install was successful. I spent a couple hours troubleshooting this issue and narrowed it down to the USBVCOM driver.
I've worked in IT for over 15 years and love it when I hear someone say, "it works for me". That's actually a running joke in the field. Just because it works for 1 person doesn't mean it will work for everyone or even most.
As far as GHL supporting Windows 10, I am now seeing mixed communications. Head on over to the GHL forum and you'll see others issues. Nice to see GHL defending their product and directing us to their sponsor forum, but if you would please help us Doser 2 owners in your own forums. Vinny did respond to me there, but his suggestion was to downgrade to Windows 8. Sorry, not an option. Please update your driver or the application's compatibility with the driver, Windows 10 and hardware.
And, myself and others have asked another question about AWC with the Doser 2 in the GHL forum but received no reply. Since the Doser instruction manual is a bit lacking perhaps you can explain how to conduct auto water changes with the Doser 2.
Thanks