That means, that you can enter (or copy and paste) a license key instead of installing a license file as described below:
To install a license key you click the Online License Key tab as shown above, copy and paste or type in the license key, and then press Get license
to register the installation to start using the license key. Internet
access and a connection to the Interform license server is required.
To install a license file you click the License File tab as shown above. Now click the Choose file icon, select your license file from your local files and click Upload license File.