If you choose to use the premium version of Kaspersky Internet Security, you can purchase a license for the app in the Kaspersky Lab eStore or from partner companies. When you buy a license, you get an activation code that you have to use to activate the premium version of the app.
When the license is due to expire, you can renew it. You can do so by either buying a new license from an online store or using an activation code for a previously purchased license.
When the license expires, the app automatically switches to the free version.
To purchase a license from an online store:
The web page of the online store opens, where you are able to purchase a new license.
To renew the license with the activation code: