Most "full version" downloads from unknown forums (like oyunindir.club or fullindir.org ) are frequently bundled with crypto miners, keyloggers, or fake "codec" installers. Because the game is old, antivirus software often misses these modern threats hidden inside old binaries.
Wait for a Steam sale. The game drops to roughly ₺5-10 Turkish Lira (approx $0.30 USD). For the price of a simit, you get the 25th Anniversary edition—which is, ironically, the most "full version" the game has been since 1998. Half-Life 1 Ucretsiz Indir Tam Surum
Technically, the game can be free. Projects like Xash3D (an open-source Half-Life engine) allow you to play the game if you legally own the .pak files. But if you don't... there is the Half-Life: Uplink demo. It’s a standalone, official 11-level mini-campaign that is 100% free and gives you the full gameplay taste without the campaign. Most "full version" downloads from unknown forums (like