If you are using a physical USB hardware key (green or blue dongle), the issue might be hardware-related. A failing USB port, a loose connection, or a blown capacitor inside the dongle can cause the "Not Recognized" flag.
Check the license file (lservrc) with a text editor. Network license files often contain references to server names or IP addresses, whereas standalone license files contain locking code information. If you are unsure, forward the license file to CSI support for identification.
If an active key is shown, choose the option to the product license over your network.
Are you using a standalone USB dongle or a cloud-based network license?
[Your Client PC] ----(Requests License)----> [Outdated Server v8.5] ----(Fails)----> Error 18 [Your Client PC] ----(Requests License)----> [Updated Server v9.2+] ----(Validates)--> SAP2000 Opens : Log into your company's license server. Sap2000 License Not Recognized Error 18
Use the Microsoft Program Install and Uninstall Troubleshooter to clear corrupted entries from previous installations.
Compare this to the code listed in your license request. If they don't match, you must request a new license file from CSI Support Update Sentinel Driver
: Because licenses are often locked to specific hardware (like Ethernet Address or CPU ID), updating drivers or changing hardware can invalidate the existing license.
: Uninstall previous versions (including evaluation copies), reboot the machine, and perform a fresh installation. If you are using a physical USB hardware
Your computer does not know where to look for the network license server.
For organization-wide floating network architectures managed via Sentinel RMS, an Error 18 points directly to an unaligned locking metric.
Error 18 is one of the most common and frustrating licensing errors encountered when launching or operating SAP2000. At its core, this error indicates that the software’s security protocols were unable to locate, validate, or successfully read a valid license file for the product. The software fails to verify its permitted use, which means it cannot move past the initial launch sequence and will prevent any modeling, analysis, or design work from beginning.
What (e.g., v18, v24, v25) is throwing this error code? Network license files often contain references to server
After a fresh installation, the installer automatically creates a default trial lservrc file. This placeholder must be replaced with the permanent license file provided by the CSI Licensing Department. Failure to replace the trial file with your genuine license file will also lead to a license recognition failure.
I can provide specific commands or paths based on your setup. Share public link
1. Re-run/Update License Registration Tools (Best for v18.0.0 - v18.1.1)