When I try to open a project in STAAD RCDC, I get an error message "License for the design code is not found".
You may also get the error message asking you to contact S-cube.
Starting with STAAD.pro CONNECT Edition Update 3 (21.03.00.146), STAAD Advanced Concrete Design is included in STAAD.Pro Advanced license, (this is part of Structural Enterprise License too).
Please make sure that you have access to the license of the design code(s).
If you need to activate the license, follow the steps from the link below.
If the license has been activated successfully, still the issue persists, then uninstall and reinstall STAAD.Pro along with RCDC. While installing, right-click on the installation file and select the option "Run as administrator" (though you may be the administrator for the machine).
Building Planner / Planwin General FAQ