It was developed by Naughty Dog exclusively for PlayStation (PS3, later PS4 via Uncharted: The Nathan Drake Collection ). Any site claiming to offer a "PC download" is distributing either a fake file, malware, or an emulated version that isn't a proper port.
Uncharted 2: Among Thieves was never officially released as a standalone download for PC, there are specific legal ways to experience the game on your computer. Official Ways to Play on PC PlayStation Plus Premium (Streaming) : You can stream the Uncharted: The Nathan Drake Collection (which includes Uncharted 2 ) to your PC using the PlayStation Plus App Uncharted 2 Pc Download Kickass