Part Two...
Install
Grand Theft Auto V\x64e.rpf\levels\gta5\vehicles.rpf
Add-On
1: Copy update folder colorado into: \Grand Theft Auto V\update\x64\dlcpacks
2:Use OpenIV and extract dlclist to your desktop from: \Grand Theft Auto V\update\update.rpf\common\data\dlclist.xml
Copy dlcpacks:\colorado\
Save and replace
3: GTAV>update>update.rpf>common>data.
-Extract extratitleupdatedata.meta and Open with Notepad. and Paste this new line.
Copy
dlc_colorado:/update:/dlc_patch/colorado/
Save and replace.
4: END