The Halo 4 medal pack has had slight adjustments to its animations and the audio files have been replaced with the high-quality originals rather than lower quality recordings than were previously used.
The Halo 3 medal pack received a small change to its script to correct an oversight (perfection can no longer be attained after a suicide or a betrayal) and a single sound file replacement.
You can download the Halo 4 medal pack here and the Halo 3 pack here. See this post if you need instructions on installing the packs.
Windows XP users will now be able to see the custom chat, although it’ll use an installed typeface rather than the featured one. This bug is caused by Windows XP itself and there isn’t a suitable workaround (apart from getting a newer OS), although you’ll be able to select your own typeface at some point in the future.
Some maps could cause the game to crash after downloading. This was a regression (plain English: it worked, then I broke it) introduced in the January update.
Forgetting to use an option (0/1/true/false) with custom_chat will no longer cause a crash.
This update introduces a Lua scriptable medal system. To get the ball rolling, I’ve provided three example medal packs (click to download); Halo 3, Halo Reach and Halo 4. To install a medal pack, simply download it to your HAC folder under the ‘packs’ directory (create it if it doesn’t exist) but do not extract it. For example: