SIMATIC 50h Eng. V20 Combo floating license download; 50 hours usage time for the following SIMATIC engineering software: STEP 7 Professional 2021 SR3, STEP 7 Professional V20, WinCC flexible 2008, WinCC Professional V20, STEP 7 Distributed Safety V5.4, STEP 7 Safety Advanced V20; software, documentation and license key for download; -- for system requirements specification, see www.siemens.com/compatool -- consignee email address required for delivery.