If you're having difficulty finding or installing updates: Learn about the latest macOS upgrade, or about old versions of macOS that are still available. Upgrade Now installs a major new version with a new name, such as macOS Big Sur.Learn about macOS Big Sur updates, for example. Official app for macOS from Telegram team. Get Telegram for Linux 64 bit Get Telegram for Linux 32 bit. Get Telegram for Windows Portable version for Windows Get Telegram for macOS Mac App Store version. Update Now installs the latest updates for the currently installed version. Fast and secure desktop app, perfectly synced with your mobile phone.From the Apple menu in the corner of your screen, choose System Preferences.