How do i save replays with the demo version?
I've seen people in the replays section who are unregistered yet they are still able to save replays?!?!

not everyone has entered the key into the forums so not everyone who has bought the game has the "registered" banner.

oh so are you saying they are members but they just dont have the banner?

The registered logo (like mine) is shown after you have entered your key to the game in your profile section on the forums. Since most people dont bother to check what is there, they dont see this option and do not get the registered banner. It is not a requirement, it is just something you can do if you want to.