In the License Management Tool, if you see the RAM Modeler license is 'Disabled", it is possible that your license has a restriction set up and all the licenses you are entitled to are in use. If you know who might be using the license, you can ask him to let you know when he is done and ask him to exit from RAM Manager. Now, wait for a little while and go back to your License Management Tool -> Activation Status; select RAM Modeler and click on 'Activate'. It should change from 'Disabled' to 'Activated'.