Was not neccesary the support the new version 1.0.59 works fine with google calendar, plus a new login page for staff, it is going fabulous!!
My BUP user is alejandro_41v22c I have written several times to BUP support about the same topic Google Calendar is not working although I have followed all the instructions listed in their page, BUP support just request an access to site and that is all, there is not a real solution coming from them.
I wonder if Google Calendar really works with Booking Ultra Pro, I have tested other plugins for this API and they work.