How to activate Kaspersky license using a key file :
1.Open Kaspersky License Manager (from lower right corner).
2.Click ‘Activate the application with a new license’ button. (Delete any trial key first, by clicking the red X next to the key).
3.Disable your internet connection (either disable Network adapter from control panel or turn off your modem/router).
4.Select ‘Activate commercial version’ and enter the activation license code as 11111-11111-11111-1111X or select ‘Activate trial license’.
5.Click Next, an error dialog box will open as "Note : After trying, please Buy the Original Software"
6.Click OK and you will now get the option to activate kaspersky using a key file.
7.Browse to the key location and activate kaspersky.
