How to update codec properly

i using k-lite codec pack 2.73 full beta 1 and would like to upgrade to k-lite mega codec 1.67.
how i going to do it step by step.
what codec should i select in order to view the movie which having codec below:
Quicktime+real+HR-HDTV+AC3+H264 avi

Thx in advance

Download the latest Klite Mega Codec Pack - install ->advanced playback / lots of stuff.
You may need to reboot, all good :wink: