Nuendo installer never start

Hi Guys,
could someone tell me how to start the installation of Nuendo 10 because
my installation stops after the full install of the installer
is it a problem with the installer, is it a problem with Sierra 10.12
or do i have to ask to take my money back
thank you for your answers
Coup de Force


Sorry I don’t really get your post. When exactly does the installer stop, pelase?