is a free-to-play game that you should only download through the official Steam Store . You do not need to look for "highly compressed" versions from unofficial websites, as these often contain malware , trojans, or ransomware that can compromise your data. Official Size and Download Details
When downloading through Steam, the game already uses compression to save you time and bandwidth: Team Fortress 2 on Steam Team Fortress 2 Highly Compressed PC Game Low Size