I disabled the security plugin on another site and checked the .htaccess has only the wordpress default entries.
It has been an hour and a half now and the GP 1.1 update has not appeared. I have also deactivated and reactivated the licencing a number of times however it has not helped to pull down the v1.1 update.
Current GP Premium plugin version is 1.0
I will check for the update again tomorrow morning, in about ten hours from now.