Sure, Todd Kopriva said “This update is not available through the automatic update mechanism” in his notice on the After Effects CS5.5.1 update. For at least a few of us though, this update fell through the cracks, as we assumed that automatic update would happen eventually through Adobe Application Manager.

It doesn’t. If you didn’t get it for all your systems, you can avoid certain bugs if you download (and install it) from After Effects for Macintosh or After Effects for Windows.

Premiere seems to have updated automatically. For more info on the recent update releases, see After Effects CS5.5 (10.5.1) update: fix for text entry bug and serial number problem and Adobe Premiere Pro CS5.5 (5.5.2) update: Maximus functionality and bug fixes.