The Siemens 6AV2105-4MM05-0AE0 is part of the SIMATIC WinCC RT Professional series. It is an upgrade package that transitions WinCC V7.0 to V7.4 RT/RC 64k-256k PowerTags to WinCC Runtime Professional 64k-256k PowerTags V15.1 in TIA Portal. This is a runtime software with a single license, and it comes with software and documentation on DVD along with a license key on a USB flash drive.