Downloading files from unofficial sources like this carries a high risk of malware or ransomware . If you're looking to play the expansion safely, it is available on official storefronts like Steam, Xbox, and PlayStation.
This shows that the full game installer was too large for a single file and was split into multiple compressed parts. You would need all parts (Part 1, Part 2, etc.) in the same folder to successfully extract the data. Aliens_Fireteam_Elite_Pathogen-FLT.part2.rar
This stands for FairLight , one of the oldest "Scene" groups known for releasing cracked games. Downloading files from unofficial sources like this carries