In order to make this retexture works, you need to install that: https://it.gta5-mods.com/player/cw-the-flash-dlc-pack-obe-studio 
after that go in "mods-update-x64-dlcpacks-CW-dlc.rpf-x64-models-cdimages-componentpeds_cw" and simply drag Flash.ytd, like that you'll have the new retextured version