If you lose the provided activation code, you can recover it in one of the following ways:
If you have access to your My Kaspersky account, you can find your activation codes in the Licenses section on the My Kaspersky portal.
If you do not have access to your My Kaspersky account, please contact Technical Support or the Kaspersky partner from whom you purchased the subscription to use the Kaspersky application.
For detailed information on how to recover an activation code using My Kaspersky, please refer to the Kaspersky Knowledge Base.