Success!
After instructing Avast that the MemuPlay installer was okay,
I this time ran the installer in my normal mode.
After signing into Google Play I was able to download the MIT Companion.
The critical part was using the Connect->Companion option and copying the 6 letter code (I was able to use copy and paste Ctrl-C Ctrl-V)
Both checkbox options on the Companion code screen work for connection technique.
I did not need to use the AI2 aistarter.exe program for this.
Sample Loom session:
I apologize for all the fumfering and blind alleys as I stumbled through my first run.
If I can find the Portrait mode icon, this is quite usable.