SIMATIC STEP 7 Professional V21 Combo; upgrade V11..V20 -> V21 or V17/2021 Combo..V20/2021 SR3 Combo-> V21/2021 SR4 Combo; floating license download; engineering software in TIA Portal; software, documentation and license key for download; 9 languages: de,en,zh included, fr,es,it,ru,ja,ko as download; for configuration of SIMATIC S7-1500/1200/300/400/WinAC, SIMATIC Basic Panels, SIMATIC Unified Basic Panels. -- for system requirements specification, see www.siemens.com/compatool -- software class A; consignee email address required for delivery.