Installation:

1: Extract "scarab_liv1.yft"

2: Using OpenIV with Edit Mode enabled, add it to "C:\Program Files (x86)\Steam\steamapps\common\Grand Theft Auto V\update\x64\dlcpacks\mpchristmas2018\dlc.rpf\x64\levels\mpchristmas2018\vehiclemods\scarab_mods.rpf\"