I put the free version of 10 on my laptop that had 7 on it.... I just use it like before.... although I haven't figured everything out.... I'm okay with that but hope to some day get it to LOOK similar to what I want it to. I use yahoo email addresses so don't have to consider what it would do with my outlook. I HATE having to change things every few years... and still have my original PC.... right now... on XP....
Edited to add.... when I first tried to download the free version...after 2 hours... it said unsuccessful..... so I deactivated my AVG anti virus program.... and another 2 hours later.... I had a successful download.