Once a key is added to the Administration Console, it is stored in the virtual folder:
Alternatively, use command line: setup.exe /p "LICENSEKEY=C:\path\to\file.key" kaspersky license key file location install
In modern Kaspersky versions (2021+), license data is stored encrypted in the registry, not as a plain .key file. You cannot simply copy-paste a key file from one PC to another. Once a key is added to the Administration
The active license data is stored in the and encrypted private folders. You cannot simply copy a .key file from this location: kaspersky license key file location install
If you cannot find the file, open a ticket with Kaspersky support. Provide your order number or activation code. They can regenerate a .key file for you.
Kaspersky often stores registration details in specific registry keys: