Allan
No. Not through automatic message.
I think, what happened, originally, 3.5 was supposed to be 3.1 and I was even using 3.1 beta for a while. Then, they decided, it's a major change, so they renamed 3.1 as 3.5, but at the same time it became independent download, not an upgrade.
patio
I don't remember, but I'm pretty sure, you can install 3.5 over 3.0