Here are key indicators to confirm you're getting the official version

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Download Source: Stick strictly to the official website (telegram.org) or reputable app stores (Google Play, Apple App Store, Microsoft Store, Mac App Store).
Developer Name: In app stores, always confirm the developer is listed as "Telegram FZ-LLC" or "Telegram Messenger LLP."
App Icon and Interface: Familiarize yourself with the official Telegram app's distinctive icon and clean interface. Be wary of any subtle deviations.
Permission Requests: During installation, pay close attention to the permissions the app requests. Be cautious if it asks for unusual or excessive permissions that seem unrelated to its core functionality.
Installation and First-Time Login Post-Download
Once your Telegram app download is complete, the installation process is typically straightforward. For downloads from app stores, installation is often automatic. If you've taiwan telegram database downloaded an APK file on Android or an installer on desktop, you'll need to manually execute the file and follow the on-screen prompts.

Upon launching Telegram for the first time, you'll be guided through the initial setup:

Enter Phone Number: Provide your mobile phone number, including your country code.
Receive Verification Code: Telegram will send a verification code. If you're already logged in on another device, this code usually arrives as an in-app message. Otherwise, it will be sent via SMS.
Input Verification Code: Enter the received code into the app.
Profile Setup (Optional): New users might be prompted to set up their name and profile picture.
If you have Two-Step Verification enabled, you'll also need to input your Cloud Password after entering the initial code.

Post-Download Maintenance: Updates and Optimization
To ensure your Telegram app remains secure, performs optimally, and has access to the latest features, regular updates are essential.