Install instructions for addon:

Navigate to this path in openIV
mods\update\x64\dlcpacks
drag and drop the "2018charU" folder.

Afterwards navigate to this path
mods\update\update.rpf\common\data
Open the "dlclist.xml" and add "<Item>dlcpacks:/2018charU/</Item>" without quotes under "<Paths>"

Put the ELS VCF in Grand Theft Auto V\ELS\pack_default