If you can not wait any longer use this : Link Removed
How to use the tool : Link Removed
You can download Windows 10 and upgrade or make media (DVD,USB) with it !
Link Removed this tutorial shows. how to force upgrade.
As a matter of interest I got the upgrade reservation app on 30th June 2015, did the reservation, and on 8th August I was informed that the upgrade was ready for me. It took about one and a half hours to run, including several re-boots.
In 2 other posts I mention that the CD/DVD was not recognised, and my iTunes did not recognise my iPad. Both posts relate how I overcame these problems. 10 now running great.