The official repository to download TupiTube Desk installers is http://maefloresta.com/portal/downloads.php. Currently, there are installers available for Windows, Mac and Linux.
When the installation process starts, you will see a progress bar like this:
That's it. From now, you could find TupiTube Desk in your Applications folder and start creating your first 2D animation project! :)
Note: Currently, there are no official .deb or .rpm installers of TupiTube Desk latest version.
Note: You can move TupiTube Desk installation directory to any other path of your preference or also, you can create a shortcut to the launcher from your desktop environment, to make easier to start it.