If you are a student or work for a non-profit, reach out to their support team. Many software developers offer discounts for educational or charitable use that aren't always advertised on the main checkout page. Troubleshooting License Key Issues
On Windows, you may need to run the app as an Administrator once to "stick" the license key to the registry. sharemouse license key
Are you setting up a workflow, or are you connecting multiple monitors on the same operating system? If you are a student or work for