Installation / Updating:

Vanilla (the recommended way)
Make sure you have ScriptHookV installed! ScriptHookVDotNet is not required.
Apart from that, just drag and drop the ChaosMod.asi and the chaosmod folder (which are located inside the downloaded zip file) into your GTA directory.

FiveM
Drop the ChaosMod.asi into the plugins folder inside the FiveM/FiveM Application Data/ folder (create the plugins folder if it doesn't exist already).
The chaosmod folder still goes into your normal GTA directory.

Additional note for Wine / Proton users
Make sure to add dinput8 as a native override, otherwise asiloader won't run. Shader effects require d3dcompiler_47 to work properly. Also install dotnet48 through winetricks / protontricks if you want to run the ChaosModVConfig.exe.

Please do note that some mods (e.g. trainers or visual mods) can conflict with some effects! If you are experiencing any problems try disabling all other mods before reporting them back!

Also make sure you run chaosmod/ChaosModVConfig.exe to look through its options to customize the mod to your liking!

Make sure to check the config utility every once in a while to see if there's an update available!