The plugins come with Syntheyes when you install it. They are in the plugins folder for Syntheyes, you have to manually move them into the AE plugins folder.
The pbk (pixel bender) plugins are not natively compatible anymore, but aescripts + aeplugins does sell Pixel Bender Accelerator which will run them manually.
-----Original Message-----
From: Byron Nash [mailto:AE-List@media-motion.tv]
Sent: Wednesday, July 15, 2015 11:13 AM
To: 'After Effects Mail List'
Subject: [AE] SynthEyes lens distortion plugins
I'd like to start working with lens distortion pipelines in order to
improve my matchmoves. I can't seem to find the download anywhere though in
their customer area for the AE plugins. I think they are pixel bender. Is
that even supported anymore?