No. Turkcel here is likely a username or team name of a Turkish repacker who optimized the game. It has no official relation to Turkcell the telecom company.

While searching for on Gezginler, you will likely find that this specific 2001 legacy version is no longer the primary focus for modern downloads. Most official repositories now host Counter-Strike 1.6

While sites like Gezginler are well-known, always ensure your antivirus is active during any "Full Indir" process. Once installed, you can customize your "Userconfig" to optimize your FPS (frames per second) by capping it at 101, which is the gold standard for smooth 1.6 gameplay. If you’d like, I can help you with: Finding specific console commands to improve your aim. Setting up a private server to play with friends. Troubleshooting "DLL missing" How would you like to optimize your setup