How do you connect the mixer to your Echo, and how do you connect it to your pc?
Do you use SONAR? (doesn't seem that way in your last post). If not, you're probably in the wrong forum..
When in SONAR, open Preferences (P), Audio, Playback and Recording. Which driver mode do you use?
 
 
 

Hoc
This how I do my recording , I connect all the mics to the mixer board, since it this has the phantom power, I don't know what I have to do to make work, doesn't know how to convert digital, analog, on the echo layla

 
What mixer are you using?

I use the Echo Mia on Windows 10 64 with no problems whatsoever. The computer is a quad core 2 with 8gb ram and running the latest Cakewalk Bandlab release. I do have a Mackie board in front of it for the mic preamps. The only reason I would ever switch is to get more input channels. I wouldn't worry that Echo doesn't support the drivers as they still seem to work and didn't require anything special like compatability mode. I hope this helps someone.