failed to download installer on server 2012 R2 and i can not unistall end point on my windows 10 pro or win7

I need your help when i tray to re-install end point for server on my server 2012 R2 it coming message ( failed to download installer) and also I can not uninstall endpoint on windows 10 pro sophos cleint .

kindly i need your help as soon as possible 

Ahmed A.Basalaa