Download the BricsCAD Network License Server installer from here.
Install the package. Make sure that the tickboxes prompted on installation are not checked.
Obtain your license file in one of two ways:
Run NetworkLicenseManager.exe (installed in C:\Program Files\Bricsys\Bricsys Network License Server), which generates a BricsCAD.lic file in the folder specified in the activation dialog.
Do a manual activation, as described in the BricsCAD Help.
Copy the following files to your RLM install directory:
bricsys.set (found in C:\Program Files\Bricsys\Bricsys Network License Server).
The license file obtained by the previous step.
(Optional) Replace the rlm.exe you have installed with our version of rlm.exe (some features will not be available on an older version).