. The specific phrasing "extra quality" is not an official CSI error term but often appears in third-party online forums where users discuss software patches or installation issues. Common Causes of Error #18 Network Connection Issues:
: Corrupted registry entries from previous installations can trigger this error. Uninstall previous versions, reboot the machine, and run the new installer with Administrative privileges Summary of Causes Possible Cause Recommended Action Outdated License Manager Upgrade to Sentinel RMS v8.6 or v9.2. Regional Settings Set PC date/number format to US mm/dd/yyyy. Network Visibility LMHOST.INI file to point to the server IP. Permission Denied Run both the installer and SAP2000 as an Administrator. For more detailed guides, you can visit the CSI Knowledge Base or check the official SentinelLM Error 18 support thread on Reddit. Are you using a standalone license network license for your office? Sentinel RMS License Manager - CSI Knowledge Base sap2000 license not recognized error 18 extra quality
If you have a newer version's license, you may need to copy its lservrc file into the folders of previous versions you wish to run. Uninstall previous versions, reboot the machine, and run