Wa Alaikum Al Salam,
Tooba Jan, how are you?
bellow for your information, hope it helps you:
To Activate Kaspersky Antivirus with a new license key
(for already installed inactive client application only)
If you have an inactive KAV, please follow the following steps in sequence:
1. Download the new license file from HERE and copy it to your desktop.
2. Open the Kaspersky activation window; either:
a. Right click on the Kaspersky icon on the Taskbar > Activate
b. OR: Start > Programs > Kaspersky Antivirus > Kaspersky for workstation. On the Kaspersky antivirus control screen:-
• On the left pane there is a link (Activate), click on it & the screen shown below will appear.
3. Choose the third options as shown, then press Next:
4. To specify the location of the new key file, press Browse
5. Select the folder we copied to the desktop in the Look in , and select the file named as shown below as the new key file:
6. Press Next to the end of the wizard and you have finished.
Source:
http://www.ju.edu.jo/Pages/Technical/HowToActivateKasper.aspx