The official Rockstar downloads page related to GTA VI includes free artwork, screenshots, trailers, and wallpapers

https://www.mediafire.com/file/uwgh9cvr0ealj95/pdf-89792-15182.pdf/file

The official Rockstar downloads page related to GTA VI includes free artwork, screenshots, trailers, and wallpapers, but not a gta vi free download for the full game.