Where can I download ABBYY License Manager/License Server for FineReader 15?
There is no separate distribution kit for the License Manager/License Server.
In case you have a license that may be deployed in LAN (Concurrent, Per Seat, Remote), the installation files for License Server and License Manager are included in the distribution kit: Download links for FineReader PDF 16
You can install License Server and License Manager when you perform Administrative installation. Please refer to the following article from the System Administrator's Guide: Installing the License Server and the License Manager.
General description of deploying in LAN could be found in Deploying ABBYY FineReader PDF in a LAN (installation on more than one computer).