Template Manager Module is protected from unauthorized acces. To use your module for the 1st time, you have to edit file "include/password_protect.php" to change current password "adminpass", for your own "strongest" password.
When you launch Manager Module, it does several things before it displays your template status. In the first few seconds (could be longer with slower internet connection), some operations are done:
Copy update files
Each time you run Manager module, it read the newest languages and template file list and refreshes your local copy.
Refresh local language list
Module checks the lang folder to see which language files are installed on your site.
Compare template and language file versions
Manager check versions for all template files and languages available on the remote server, it builds a list of already installed and others that are available (if applicable). It compares all local and remote versions and display them in the proper section.