AE doesn't work on Linux.
If that's not the problem, perhaps telling us more info such as what OS you're using might help. What steps are you actually taking? Where are you downloading AE from?
Im using Creative Suite 6 master class disk, Im on a macbook pro, Ive tried downloading the trail version and the same thing happened. I have taken photos of whats actually happening if you wanted to see. I don't know what linux is to be honest.
> I don't know what linux is to be honest.
That was Szalam's way of pointing out that you gave very little information; he was making an obviously silly guess to fill in the gaps in information.
Start by applying the most recent update for After Effects CS6:
He's funny, Thank you i clicked the link but it basically just comes up with a forum there isn't a link to where I can up date.
The page that I gave a link to explains how to install updates.