download this: https://www.gta5-mods.com/tools/mapeditor-2-ymap-converter
2- open example DLC pack and copy custom_maps dlc file to mods\update\x64\dlcpacks
3- drop uparvehcargen.ymap in: mods\update\x64\dlcpacks\custom_maps\dlc.rpf\x64\levels\gta5\_citye\maps\custom_maps.rpf
4- install UARV.oiv from OIV installation folder
5- done enjoy!