SEP 12.1.5 GPO Deployment issue

Hi. i'm trying to deploy sep 12.1.5 to all clients throug gpo

i followed the guide on sep installtion and administartion but with no luck

the pc is booting up i get the "please wait" screen for a few minutes but the packge isn't installing

iv'e created a packged using SEPM put it on a share folder and gave "domain computer" + "authenticated users" modify premissio.

how can i resolve the issue what am i missing?

thanks

Omer.