SIMATIC WINCC ADVANCED SUS (DOWNLOAD) SOFTWARE UPDATE SERVICE, WITHIN THE FRAMEWORK OF THIS CONTRACT, YOU WILL RECEIVE UPDATED SOFTWARE VERSIONS FOR A PERIOD OF ONE YEAR. IF IT IS NOT CANCELED THREE MONTHS PRIOR TO ITS EXPIRATION. PERIOD OF DELIVERY AND PERFORMANCE: 1 YEAR FROM DATE OF INVOICE PREREQUISITE FOR CONTRACT: CURRENT VERSION OF THE SOFTWARE ******************************* E-MAIL ADDRESS IS MANDATORY FOR DELIVERY!