For network licensing, the FNP version of the workstation should equal or lower than the FNP version on the server, so you need to know how to check the FNP version on both workstation and the server, here is how to check on the server.
For workstation, please check here.
On the server, there are 3 ways to check the FNP(FlexNet Publisher) version
Way 1: Start lmtools, check About information from Help menu.
Way 2: Check the property of lmtools.exe or lmgrd.exe file. Following is the lmgrd.exe file property FYI.
