@sabih,
I forwarded your compliant to Audio Classics since McIntosh has no email address listed. They will forward your information to McIntosh, but they SAID the upgrade is ALREADY available on the McIntosh website as theyALREADY posted above.
"For units with DA1 Digital Audio Modules: McIntosh USB Audio Windows Driver D V2.0.. please see detailed instructions on their web site".
Audio Classics get an A+ for helping me. I saw your post and immediately attempted to email McIntosh but could not. I contacted Audio Classics for assistance and they responded very quickly and your problem is solved.
Thank you Audio classics for this OUTSTANDING customer service.