Is the standalone Spaceclaim application opening without any issues? If yes, please try these suggestions and check if the issue is resolved after each suggestion.
Open Workbench and verify if Tools > Options >Geometry Import >Use SpaceClaim Direct Modeler as External CAD is NOT checked. Also, make sure SpaceClaim Direct Modeler is selected as Preferred geometry editor.
Open Product & CAD Configuration Manager from START menu as Administartor> Install Required prerequisites. After installing, click on Unconfigure Products and CAD> Select all > Hit Next. After Unconfiguring, click on Configure Products and CAD> Select all and hit Next. Open workbench again.
Open CAD Configuration Manager from START menu as Administartor > Check Spaceclaim>Hit Next> Configure Selected CAD Interfaces.
Run this command as administartor in command prompt: