GOG (Good Old Games): This is the preferred choice for Windows 7 users because GOG games are DRM-free. Their installers are often optimized for compatibility with legacy operating systems. Installation Tips for Windows 7 Users
A BioShock Infinite download for Windows 7 allows you to play a definitive piece of art on a classic OS. By sticking to reputable stores and keeping your drivers updated, you can explore the clouds of Columbia without technical interruptions. Whether it is your first time or a return trip, the world of BioShock Infinite is waiting to be discovered.
Steam: The most popular choice. Steam automatically handles patches and provides cloud saves, which is helpful if you eventually migrate to a newer PC.
5/5 Stars (with a minor 32-bit warning)
In your search for a download, you may stumble upon "repack" sites or free download links on shady forums. Do not click them. BioShock Infinite is an AAA title that is frequently targeted by malware distributors. Stick to authorized retailers. The cost of the game is far cheaper than the cost of a compromised computer.
This means no more security updates. If you are downloading games on a Windows 7 machine connected to the internet, you are navigating a digital sky full of unseen flak. While BioShock Infinite remains one of the last great titles perfectly suited for that OS, the infrastructure supporting it (like the Steam client itself) is slowly moving away from legacy support.