Make sure to first have SuperBLT installed. Click the link in the dependency list.

Optional video tutorial for installing SuperBLT, BeardLib, and mod_overrides mods: https://youtu.be/rin_sjSJIkg

1. After downloading the mod, use a program such as 7zip or WinRAR to extract the main folder of the mod.
2. Drop that folder into the mods folder which is supposed to be in the game's installation folder (don't know where that is? click here)

Installation:

Installing ACH:

1. Follow the download link
2. Unzip the .zip file into your mods folder using the archive utility of your choice (I recommend 7zip)
3. Launch the game. You are now ready to use ACH and install addons.

Installing addons:
Addon folders should be installed in one of the following folders, according to the type of addon:

/mods/saves/ACH Addons/Crosshairs/

/mods/saves/ACH Addons/Hitmarkers/

/mods/saves/ACH Addons/Hitsounds/

Please note that the ACH Addons folder does not exist until you launch the game with ACH installed for the first time.
If you wish, you may opt to create the appropriate folders yourself, however.