Remastered versions of the series are frequently given away for free to Amazon Prime members.
If you are looking to play BioShock 2 Remastered safely and legally, there are several verified ways to obtain it, often at a very low cost. Official Ways to Get BioShock 2 Remastered BioShock 2 Remastered Free Download (v31.08.2022)
The Remastered edition includes upgraded textures, 4K resolution support, and all single-player DLC: Remastered versions of the series are frequently given