Where can I download ABBYY License Manager/License Server for FineReader 15?
There is no special 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 of the license.
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 15 in a LAN (installation on more than one computer).