The Siemens 6AV2105-4MM07-0AK0 is part of the SIMATIC WinCC RT Professional series. It is an upgrade package that transitions WinCC V7.3 to V7.5 RT 64k-256k PowerTags to WinCC Runtime Professional 64k-256k PowerTags V17 in TIA Portal. This is a runtime software with a single license, and it comes with a software and license key download instead of a physical USB flash drive.