I don't "expect" them to support the insider release necessarily, but I do think it's valuable information for them to have that there appears to be a compatibility issue. The insider version will someday be the release version -- so . . .
Also, since the Avast version BEFORE the latest release did work on the same Windows version without issue - clearly some change in the Avast is what led to the incompatibility, not a change in the Windows o/s.
I also didn't post here politely and in good faith to be flamed at, so please don't.
Best/jim