I use SONAR and mi.1. I recommend installing the newest BandLab Cakewalk too.
If that is difficult, I suggest using MIDIberry-IO mi.1
. It supports bi-directional communication, unlike MIDIberry.
To use it, you need to add two virtual MIDI ports using loopMIDI.
I have confirmed that it works properly with SONAR Producer v8.5. I hope that Sonar Producer v8.3.1 will also work.