Ok, since I could not find a copy of the software to work with my later model 850, I researched alternatives, bit the bullet, and ended up buying a Logitech Harmony Elite.

I've seen the light. I suffered with my antiquated URC product for much longer than I should have. I was a diehard fan, having models going back to the early 2000s.

The Harmony Elite is 2017 technology. The 850 is 2001 technology.

I can program with my ipad, it syncs with my smart home products, device response is instant and reliable, and Logitech customer support will add missing codes or commands to the remote simply by emailing them a request (imagine URC doing that, hahah), and there is a charging cradle (no more dead triple As).

Expensive, but worth every penny. I don't miss anything about my 850.