You can often find registration details by navigating to the Registry Editor and searching for values like PCID under the Kaspersky software hive.

Kaspersky does not store the raw .key file in a simple folder on your hard drive after activation. Instead, the license information is integrated into the application's internal database or the Windows Registry .

Launch your Kaspersky software (e.g., Kaspersky Endpoint Security).

Choose the option to Activate the application under a new license and select Activate with a key file .