Installation:

Open the downloaded zip file and go to the folders inside the archive. Drag the matching files into the corresponding directories in OpenIV and replace the originals.

Navigate to -
x64g.rpf\levels\gta5\generic\cutspeds.rpf\cs_lamardavis

Then navigate to -
x64e.rpf\models\cdimages\streamedpeds_ig.rpf\ig_lamardavisa

Make sure to back up your original files and install everything inside your mods folder.