FTR: I install K-Lite Codec Pack and customize everything during install and also use the Codec Tweak Tool (and Preferred Filter Tweaker if not on Win7 machine) to switch preferred filters/splitters and enable/disable anything.
Codec Tweak Tool > Configuration: DSFilters > if you see Haali, it's enabled. If it's missing, it's not registered/enabled/installed.
Codec Tweak Tool > Codec and Filter management: Preferred Splitters > Haali should show up in the options for some formats (AVI, MKV, MP4, etc).
KLCP installs Haali 1.11.288.0. I don't install Haali on its own anymore, I've been using the one that comes with KLCP and it's always been compatible with A2D, regardless of version (of Haali or A2D) for as long as I can remember.
Codec Tweak Tool can be downloaded separately, mirrored on VideoHelp.
Code:
http://www.videohelp.com/tools/Codec-Tweak-Tool
CodecGuide has a list of mirrors where you can download it from as well...
Code:
http://www.codecguide.com/download_other.htm
For Windows 7/8 environments, make sure to also use...
Code:
http://www.codecguide.com/windows7_preferred_filter_tweaker.htm