I understand there are a few questions related to this topic which is why I don't think it's duplicate, and that there is one directly addressing it. I am still extremely paranoid about this, and would still like to let you guys know how EXACTLY how I did it, since the process might be different from the other questions.
I believe the upgrade process is the same for both Windows 7 and 8.1 since I have PCs running both of those OSs that I would like to upgrade.
I didn't install other updates before I decided to upgrade to Windows 10.
Then I went to this website and I downloaded the 64-bit tool listed on that site.
Afterwards, I run the media creation tool.

It leads to the above image.
Will this program A) download AND install or B) download OR install?
Best case scenario it downloads and waits for me to give it the ok before installing.
When I give it the ok and it finishes, will the result be a WIPED computer or will all my personal documents/files all be there?