Removing from the inside
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2016 BMW 760Li, 2015 BMW 760Li, 2014 BMW 760Li, 2013 BMW 760Li, and 2012 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.
Guide knife carefully between body and window glass.
Run blade of knife parallel to glass.
Take care not to damage paintwork.
Cut through adhesive bead all the way around.
Pull window glass outwards to remove.