When you install w10, you have two options: do a clean install, or mantain the files and data.
You'll see something like this: https://cdn2.expertreviews.co.uk/sites/expertreviews/files/2015/07/3_0.png?itok=Y1aGh4uJ
If you go with the second one, all the data will be saved in "wondows.old", a folder that will be created in the root of your main drive.
There's a new "magazine" 'round these parts, one of those where you get a piece of a model ship every issue, and you can build the whole ship eventually.