You will obtain a code, copy it and paste in a empty text file inside gta5.exe folder (main game folder), the name can be imv.txt for example, what is important is that need to be a text file (.txt extension). It's better do this with game closed.
(BR: Você irá obter um código, copie este código e cole em um arquivo de texto com qualquer nome dentro da pasta do gta5.exe. Faça isso com o jogo fechado de preferência)
Tip: Download Mark III armor here
Important:
Consider that you need ASI Loader, ScriptHookV and ScriptHookVDotNet working to use my mods, even to generate the nibmods_log.txt file :)
If scripts are being loaded properly, the file nibmods_log.txt will be located in gta5 Scripts folder after first game load. Run game as administrator.
Case you can't download the mod using the installer from gta5base, download the zip directly from mirrors here.