drag the "nivinha_maps" folder into : Grand Theft Auto V-mods-update-x64-dlcpacks.

then go to :

Grand Theft Auto V-mods-update-update.rpf-common-data


Locate "dlclist.xml" right click on edit and add this command line at the end of the list 

<Item>dlcpacks:\nivinha_maps\</Item>




Start game