Automatic activation of the serial number is blocked after the local installation of FineReader PDF 15 with a Concurrent license.
The Concurrent license is not implied for the local installation on one computer (standard software installation): Installation and activation methods by license type and product version.
The program should be deployed in LAN with the installation of the License Server and License Manager and creation of the administrative installation point.
Please submit a request and specify the serial number of your copy of the program. After the agent of the support team has increased the number of activations, perform the network installation of the program as described in the article: Deploying FineReader PDF 15 in LAN (installation on more than one computer).