Audio Research DAC8 Firmware

Does anyone have the latest firmware for this unit?  With later Mac OS updates the unit no longer communicates via USB. I had heard the 1.30 version, if it exists, may fix that issue.  I tried to contact ARC through email but no response thus far and it’s been over a week. They don’t provide firmware for this unit on their site anymore. Latest I could find is 1.28. If anyone has latest FW and could post a link I’d greatly appreciate it. Many thanks.