Before starting please make sure that you have successfully installed on your system the latest Orange version of Orange Data Mining.
Choose Download from the navigation bar (or go to the download page). Select the suitable version for you operating system, download and install it.
Important
If you are a window user and you have securities issues prohibiting the installation you can download the Portable Orange. In this case you do not have to install anything.
Just extract the archive and open (double click on) the shortcut in the extracted folder.