I think I'm having the similar issues on my t8.
When I clear data and create the source, the newly created wookie add on does NOT ask me for a user/pass and installs fine. However, when I open it and try to go to the wookie, it now requires a user/pass and I can't enter them because the keyboard fix is inside the wookie!! (Ive tried running the keyboard fix before the retro/new wizard but this just errors) The Xunity fix also doesn't work and I have tried changing skin while doing it, etc. Any other advice??