update 3035583 advanced notification or update for w10?

hi fans,
 
i have a new service in w8.1 (perhaps for windows-7-users too) in preparation for w10...
 
read this from microsoft/kb/3035583
 
http://ift.tt/1c6U9TV

 

is this only a advanced notification-serivce to tell me, if w10 available to download or i need this as "must have" to become w10 as upgrade?

 

do i need this or can i also upgrade to w10 without kb 3035583?

update 3035583 advanced notification or update for w10?