Avid QuickTime / DNxHD codec for Windows / Mac

Do a Google search for "avid codec" for latest, here is what is available as of May 2013.

Avid QuickTime Codecs LE 2.3.8

Avid Knowledge base:

http://avid.force.com/pkb/articles/en_US/download/Avid-QuickTime-Codecs-LE-2-3-8