Install instructions:

Single Player:
Using OpenIV
-Copy xjr15 folder in mods\update\x64\dlcpacks
-Add: dlcpacks:\xjr15\ to the file dlclist.xml in mods\update\update.rpf\common\data
-Spawn name: xjr15

Fivem

Copy folder xjr15 inside 'fivem' to your server resources folder, add 'start xjr15' to your server.cfg
spaw name: xjr15 