Hi,
what exactly do you mean with the autoupdate button? If you are already using the current version of the gallery there is no need for an update.
If you want to install additional extensions for the gallery please havea look at the admin menu of JoomGallery. There will also be stated that the gallery is up-to-date.
Regards
Chraneco
I'm already using the latest version, but I am asking for future updates...I think that in the previous versions there was somewhere an update button...which I cannot find now...