The Kaspersky Partner license was bought from Kaspersky directly.
Is it possible to use this type of license in Plesk?
If Kaspersky was installed via Plesk, it is needed to buy a license from Plesk directly.
If the license was bought on Kaspersky side, it is needed to install and use Kaspersky as an additional server program. Note that such scenario is not supported by Plesk.