http://www.njnoordhoek.com/?p=660
with focus usb, but it gives an error when you select the Focus USB Ascom driver in the Ascom dialog.

I have tried both the 32 bit and 64bit version of Bahtinov Grabber but no luck, same error.
Unfortunately Bahtinov Grabber is no longer being developed as the author has passed, but I thought I check here to see if there was some solution.
I'm using the current ASCOM version.