Telegram Desktop Portable is available for immediate download from the Telegram Desktop Portable homepage.Next to Whatsapp, Telegram is the biggest messaging application out there with more than a 100 million users. And it's in Format, so it automatically works with the Platform including the Menu and Backup Utility. It supports upgrades by installing right over an existing copy, preserving all settings. Telegram Desktop Portable is packaged in a Installer so it will automatically detect an existing installation when your drive is plugged in. As a result, Telegram is like SMS and email combined - and can take care of all your personal or business messaging needs. You can write to your phone contacts and find people by their usernames. With Telegram, you can send messages, photos, videos and files of any type (doc, zip, mp3, etc), as well as create groups for up to 5000 people or channels for broadcasting to unlimited audiences. You can use Telegram on all your devices at the same time - your messages sync seamlessly across any number of your phones, tablets or computers. Telegram is a messaging app with a focus on speed and security, it’s super-fast, simple and free. Update automatically or install from the portable app store in the Platform.

And it's open source and completely free. It's packaged in Format so it can easily integrate with the Platform.

Telegram is a cloud-based mobile and desktop messaging app with a focus on security and speed. A new version of Telegram Desktop Portable has been released.

For windows instal Telegram 4.8.7