Double-click the Kaspersky icon in your system tray (near the clock) or on your desktop.
If you already have an existing (even expired) license, you can obtain a renewal key through the Kaspersky Renewal & Upgrade Center . Activation and Use kaspersky internet security 21.3 license key
Assuming you have a legitimate license key (purchased or a genuine leftover from 2021), follow this guide: Double-click the Kaspersky icon in your system tray
Official Website: Buying directly from Kaspersky ensures you get the most recent version and a secure transaction. kaspersky internet security 21.3 license key
Click . Ensure you are connected to the internet so the software can verify the code with Kaspersky servers. 3. Official Alternatives