Yet another solution that may work if anyone else is forced into this dilemma, as I was :( I hope so. I almost took that old, but new remote into the back yard to fine tune with a 12 ga.
After three hours of trying every combination of iterations I'd read about, always knowing in my heart that Windoze knows not what it does at any given time, I finally had a rush of brains to the head!
This is for my SIIG adapter, curiously named "USB to Serial-Value", and my Win10 Ultrabook.
Clean out the ports' existing driver info. For me Prolific 3.8.12.0 taunted me with mentions of Win7-8-&10, obtained here:
[Link: prolific.com.tw]and install. Re-boot. Plug in the adapter, check Devmgr for assigned port if you didn't catch it, and launch the Editor in Compatibility Mode for Win 7. Set that port, use default properties, or slow the baud and lower the buffers, I did this, even to start out. I always run in superuser or Admin, so I don't know if it helped or not.
Plug in the Aeros MX-850 with good batteries, and if it gives you the firmware back you should be good to go.
Bruce