The Siemens part number 6AV6381-2BF07-3AH0 refers to SIMATIC WinCC system software V7.3, RT 65536. 

Runtime software supporting up to 65,536 PowerTags

Single license model

Download-only delivery (no physical media)

Software and license key provided digitally

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

Compatible with:

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

Windows 8.1 Standard/Professional/Enterprise/Ultimate (64-bit)

Windows Server 2008 R2 SP1 (64-bit)

Windows Server 2012 (64-bit)

Classified as a Class A product (standard stock item)

This product was officially discontinued without replacement as of March 31, 2023.