Halo Custom Edition (HaloCE) is a free multiplayer-only version of Halo Combat Evolved (HaloPC). It offers user-created content such as custom-made maps, objects and other features which wouldn't be possible with Halo PC.
Installing HaloCE requires your usual HaloPC key and it's possible to have both CE and PC installed together using the same CD key.
3. From now on everything should work properly, but sometimes you may get "hac2 126 error" or 'Microsoft Runtime error' when trying to run HaloCE - if this is the case, you will need to download these files (download and install both of them if you are on x64):
Once you're connected to the Internet Lobby serverlist, you will need to make sure that you can actually see the custom maps (not just the usual Halo maps like Bloodgulch, Chillout etc). To do this you will need to make sure that the 'Show custom maps' option is enabled in the filters. Once you have this enabled then you should be able to see the custom maps in the serverlist.
It's important to understand at this point that HaloCE does NOT come with any custom maps installed - only the standard maps, the same as HaloPC.
So how do you play on custom maps if they aren't installed ? Simple really.. by downloading and installing HAC2 (see next section).
As well as other functions, HAC2 will automatically download custom maps for you when you try to join a server - you won't need to mess about looking for the maps to install manually. Once HAC2 is installed, all that will happen is that when you click to join a server using a custom map, HaloCE will show a message saying 'Initiating map download' and start to download the map. Once the download has finished, the game will start and you can then play on the custom map. Just be aware that some custom maps can be quite large, so depending on the speed of your connection, it may take a while for the download to complete. But once the map has downloaded, then it won't be necessary to download it again if you select another server using the same map.