Check out this video of CXGAMG - https://youtu.be/Puuz6ZZBjLg?feature=shared ; he did a better job than me when it came to explaining the installation procedure.

Also, you need the following files in order to do so : 
Archive Explorer by xaeroneo - https://www.nexusmods.com/scarfacetheworldisyours/mods/1

Also, you need to have the official patches, so that your gameplay experience might become less buggy.
Official Patches by xaeroneo - https://www.nexusmods.com/scarfacetheworldisyours/mods/10