You have to render the video first before you can put it into AE. To render the demo, use
this. You will get a huge folder (I mean 10 gb for 1 minutes worth or more) of tga images and a wav sound file. AE might accept this, I'm not sure. If not, use
this to compile the tgas into an avi or something and then pop that into AE. Also, if you don't have a 1080p monitor, use
this to render in 1080p - make sure you check it in lawena before you use it.
Hope that helped!