This famous DLC is typically a paid standalone title or part of the main game's "Remastered" or "Part I" editions. Literature and Comics
The availability of a "free download" for each depends on the specific title and the platform. Video Games
If you are looking for written works, free and legal digital copies are available through digital libraries: Those Left Behind on Steam
Often confused with the former, this is a hyper-realistic psychological horror game by SolitaryStudios. A free demo is available on Itch.io and Softonic .