checkingthe link above it seems you have ti press "reserve copy" which you probably did, and it will download automatically once available and it will notify you once download is finished.
You can probably click that button and it will show you the status of download or if it is finished.
Explore a bit. And I guess once the installation is downloaded, maybe you will have to activate installation.
I hope osmoene who already did these things will be able to help.
I am on Mac and can't help much, but i am sure you will enjoy new features and stuff from updated Windows.
P.S. after this upgrade I think you won't need to copy and move things, everything will be in the same place as it is now which is good, but anyways it is great you shave saved staff just in case.