If the Ram Modeler license is disabled you will not be able to open Ram Structural System (Ram Manager) at all.
Open the License Management Tool. This is ordinarily done from Ram Manager - Tools - Manage Licenses..., but if the Ram Manager won't start it can also be done by starting the License Management Tool from another application, or by double clicking the LicenseTool.exe from the folder where it is installed. A Windows Search for "LicenseTool.exe" usually finds it quickly.
In the License Management Tool, on the Activation Status screen, if you see the RAM Modeler license is 'Disabled", it is possible that your license has a check-out only restriction set up and all the licenses you are entitled to are currently in use. Check on the License Checkout tab in this case. If a License for Ram Modeler is available, check it out using the current version information. If no license is available, then one must be checked back in before using RAM Modeler on this machine.
After the license is checked back in, return to the License Management Tool -> Activation Status screen, select RAM Modeler, and click on 'Activate'. It should change from 'Disabled' to 'Activated'.
RAM Manager fails to open on 64-bit OS