The Siemens part number 6AV6381-2BN07-2AH0 refers to SIMATIC WinCC system software V7.2, RC 512. 

Runtime/Configuration software supporting up to 512 PowerTags

Floating license model

Download-only delivery (no physical media)

Software and license key provided digitally (email address required)

Supports 5 languages: German, English, French, Spanish, and Italian

Compatible with legacy operating systems:

Windows XP Professional SP3 (32-bit)

Windows 7 Professional/Enterprise/Ultimate SP1 (32/64-bit)

Windows Server 2003 SP2, Server 2003 R2 SP2 (32-bit)

Windows Server 2008 SP2 (32-bit)

Windows Server 2008 R2 SP1 (64-bit)

Classified as a Class A product (standard stock item)