There are countless free ones on Megaupload.
You can download it by searching, "Adobe After Effects CS4 Download." After you search it, an option should be, Adobe After Effects CS4 on Adobe.com. Once you select that option you can sign-up on Adobe, and download the free trial.
Google 'Adobe After Effects Download'. When the official Adobe Link pops up, click that. The download's on that page.
Adobe After Effects CS6 is available to download as a trial version on the official Adobe website. Please see the link posted below to be directly linked to the download page.
See the Related Links below for the official Adobe After Effects CS4 free trial download you need, plus a solution for your situation.
From the Adobe website, but you will have to pay to use the full package permanently.
You can't download anything without an internet connection
No if you download from official Adobe site. See related link for download without viruses.
You cannot download the full version for free. (That would be illegal). But you can download the 30 day trial version from Adobe's website (adobe.com -> downloads -> trial downloads -> adobe after affects -> try -> login -> download!).
As far as I know, CS5 and CS4 cost about $250 average. However, I have Adobe After Effects CS3 Pro, for free. There are numerous download links on youtube for CS3, but you should watch out. I can't count how many of those programs are spyware.
You cannot download adobe on to a 3DS
Trapcode Form is a product of Red Giant, you can purchase it from their website.
You can download adobe reader from Adobe's website, or from other third party hosts.