Thanks Austin316 for finding that missing double quote. Without that, the Avatar image was not appearing when the edit profile page loaded.
Here is where I messed up - there is a line of code ending with:
onLoad="generateimage('$Avatar')">That last double quote must be there.
I have made changes to my
instructions file.
Note: this file is not the actual Avatar Addon instructions - it only documents what I did to get it working on 5.44a.