Help please: No sound with Coolstar Audio drivers on Acer Spin 713 Chromebook

Do you guys have any ideas why there is no sound?
I installed the paid audio driver csaudiosstavs.zip which I confirmed are installed in the device manager. I also installed all the other drivers (which do work correctly).

This is with an akali360:
Acer Chromebook Spin 13 (CP713-1WN)

Your help is very much appreciated.