Hi. I have been trying to update my MX-700, I have the latest software from URC and IR databases but it appears to be a non-go in terms of communicating with my MX-700. I keep getting communication errors. My cables worked in the past, but it has been years since I programmed the MX-700.

Did you have that problem and how did you work around it?

FWIW, I am running Win 7 64bit with a generic USB to com port adapter (that the MX-700 cable plugs into). Windows found and installed a Prolific driver for it.
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Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 976 pre-pro running 5.1 system
Outlaw 750 for Artison Masterpiece LCR and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
LG OLED65C8PUA via HDMI2 to/from 976 HDMI ARC
Roku Ultra
Samsung BD-D5500 BluRay
Amazon FireStick 4K to 976 Aux HDMI input for Amazon Music Ultra