If you already use Virto Image Slider web part and need to upgrade it to the latest version, download the.zip file from http://www.virtosoftware.com. Unzip the file and run setup.exe as it is described in the Installing Virto Image Slider section.
On the step 3 check the box “Upgrade” and click “Next”.
Note: if you had activated the license while installing the previous Virto Image Slider web part version, you do not need to activate it now.