If you are updating your PTC software, you can use PTC Installation Assistant to generate a license file. The license generation process is based on the product code for your Maintenance Release shipment. Alternatively, you can request electronic copies of your License Packs by either contacting PTC License Management directly or clicking Retrieve Existing License Packs under LICENSING on the Creo eSupport Center page and following the instructions. A License Pack for a Maintenance Release shipment contains all the qualifying licenses for the specified site.