The Siemens part number 6AV6381-2CB07-4AX3 refers to the SIMATIC WinCC RC Client Upgrade from V7.X to V7.4 SP1. It’s a runtime/configuration software upgrade package designed for WinCC RC clients (excluding RC128). 

Type: Software upgrade (from V7.X to V7.4 SP1)

License: Single license with USB key

Media: 2x DVD + 1x USB flash drive

Languages: Typically includes major European languages

Supported OS: Windows 7, 8.1, 10 (Professional/Enterprise), and Windows Server 2008 R2, 2012 R2, 2016 (all 64-bit)

Net Weight: Approx. 0.212 kg

Packaging Dimensions: 18.70 x 26.90 x 3.20 cm

Lifecycle Status: Discontinued as of March 31, 2023