Telegram is Free and Open Source Software (FOSS) . There are no paid "pro" versions of the desktop client that require a license key. Any site claiming otherwise is a scam. How to Get Telegram Safely
: Update your passwords for sensitive accounts (email, banking, etc.) from a known clean device. Telegram is Free and Open Source Software (FOSS)
: Use a reputable antivirus like Microsoft Defender or Malwarebytes. Telegram is Free and Open Source Software (FOSS)
: Scan your files for private keys or recovery phrases. Telegram is Free and Open Source Software (FOSS)