Installation:
[Editing the dlclist.xml]
1. Create a folder named "lummag770" in :\Grand Theft Auto V\mods\update\x64\dlcpacks
2. Open OpenIV and extract the "dlc.rpf" from the current archive to \Grand Theft Auto V\update\x64\dlcpacks
3. Add the following line:

dlcpacks:\lummag770\

4. Save the changes and copy the edited "dlclist.xml" back to: \Grand Theft Auto V\update\update.rpf\common\data

[Editing the extratitleupdatedata.meta]
5. Using OpenIV, go to: \Grand Theft Auto V\update\update.rpf\common\data — and extract the "extratitleupdatedata.meta" in some folder of your choice.
6. Add the following line:

dlc_lummag770:/update:/dlc_patch/lummag770/

7. Save the changes and copy the edited "extratitleupdatedata.meta" to: \Grand Theft Auto V\update\update.rpf\common\data