In first start-up of the program, it automatically started and did some minor syncing but the About window initially displayed with Internal error mentioned above…
I shut down Windows 10 desktop beta 11 and then restarted the program. This time I was asked to login to my account again and select the PhotoStructure library (the default library location was shown and selected and I had to change the library to where my library is located) All photo locations were correctly shown. Once I had logged in and library location selected, it worked correctly with no obvious syncing etc. The About window showed correctly.