I had similar problems, but I tryed one by one all options and it starts. After programing I got several errors and car stop to responce for enything.If I understand corretly, your problem is that the VXdiag does not show up in the device list, right?
You need to run VX Manager -> click the Diagnostic tab -> PASS THRU -> Install
I charge the 12V aku to 100% and after that car starts to move. Unfortunately now I have errors: P1e00, P0d69 and U0111. Now car driven only on gasoline. I can't charge it from the wall. I'm still search for solution.
There are new proces for ACDelco: