You are installing component on 'localhost', please visit the My Downloads page and take the license number from there. Then, just input license number in next field so you can install component.
This is a message when I try to install the component on my pc. On my Downloads page I can't see the licence. Can you help me?

Hi Ken,

Go to this page:
www.jomsocial.com/component/digistore/licenses

There you will see the extension's name and next the license ID. If you have localhost already included on that license you can use iJoomla Installer on your computer. But if you can't install it, maybe a firewall is blocking the connection to our server. In that case use the downloaded package to install the extension.

Best regards,