Innstalation:
1. Drop custom_maps folder into mods/update/x64/dlcpacks

2. Go to mods/update/update.rpf/common/data/dlclist.xml
and paste 
<Item>dlcpacks:/custom_maps/</Item>



Custom Radio Station

Custom GCP Radio is based on Custom Radio Stations [.NET] mod by stillhere

1. Download the original mod https://ru.gta5-mods.com/scripts/custom-radio-stations-net#comments_tab

2. Put the GCP Radio folder in GTA root folder/scripts/Custom Radio Station



Loading all maps can cause lags with light. If so go to Grand Theft Auto V\mods\update\x64\dlcpacks\custom_maps\dlc.rpf\x64\levels\gta5\_citye\maps\custom_maps.rpf\ and remove .ymap files of sertain streets you don`t need.