The tool costs money

Fing Desktop was released on a ‘Freemium’ basis, i.e. it is free of charge, but a premium is charged for additional features, services, tools etc. that expand the functionality of the free version of the software.

Fing Desktop still does have free features that can be used, some of these have limited daily credit’s however. Once the credits run out for that particular feature, you will have to wait for the following day to get more credits, or subscribe to Fing Desktop Premium.

Credits cannot be accumulated, i.e. they will reset each day.

Premium Plan info: https://app.fing.com/internet/account/subscribe/choose#