After Effects CS4 Mac setup problems!

[somewhatvaguely]

The adobe after effects cs4 disk image came up, I clicked it, clicked the folder, clicked bootstrapper.dmg, clicked setup. The setup dock icon popped up, then disappeared. What am I doing wrong?!?!

I got a trial from the adobe website, so it should be fine, right?

 

[somewhatvaguely]

Oh, never mind(I keep solving my own problems!) apparently yesterday the Setup.app thing was botched so I couldn't open it, but now it's totally fine.