(http://i62.tinypic.com/1sjvh1.jpg)
So believe it or not, despite all the champagne and fanfare, there are a lot of people who don’t have Windows 10 yet.
If you fall into that category, Microsoft has a message for you – be patient, it’s coming!
At this point, there’s a queue and your upgrade is simply waiting in line for its number to be called. When that happens, the upgrade notification icon will appear on your desktop.
The strain of all these upgrades happening at once would probably bend the very fabric of the web so Microsoft have chosen to take the safer route and are installing sequentially.
It’s still a massive undertaking but it makes more sense this way.
So bottom line, be patient, it’s on it’s way or you can download the official Windows 10 RTM ISO files (http://www.windows10newsinfo.com/smf/index.php?topic=30014.0).
source (http://www.windows10update.com/2015/07/if-windows-10-hasnt-started-downloading-for-you/)