The "Original" version is often included automatically when you purchase or claim the Remastered version.

The original version does not have a robust autosave system; manual saving is your best friend.

Use the Research Camera on every enemy type to unlock permanent damage boosts and unique tonics.

Right-click the game in your library, go to Properties > Compatibility , and run the game in "Compatibility Mode for Windows 7."

Finding a legal "free download" for the original BioShock (2007) is rare, as the game is a paid title. However, it is frequently bundled or offered as a bonus on major platforms. Where to Get BioShock (Original)