Publisher at .422. Downloaded Photo at .434 and StudioLink successfully linked. Downloaded Designer at .434 and StudioLink failed (says get beta).
Uninstalled Designer beta and reinstalled. Same situation. Looked for earlier approaches - go to …\appinfo\Beta and delete Designer Release.appinfo. After most recent installed of Designer beta there is nothing under that directory.
For non-beta (Release directory) there is both Designer Release.appinfo and Photo Release.appinfo and of course for the Release version StudioLink worked out of the box (realizing that it didn't for many).
Windows 10 version 1903.
Believe it or not this is by design as we are changing the detection and you will need a new Publisher build for them all to use the same mechanism, sorry for the confusion this causes.
A new Publisher beta is imminent