The Siemens part number 6AV6381-2BF07-4AX0 refers to SIMATIC WinCC system software V7.4 SP1, RT 65536. 

Runtime software supporting up to 65,536 PowerTags

Single license model

Delivered on DVD with a USB flash drive containing the license key

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

Compatible with:

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

Windows 8.1 Professional/Enterprise (32/64-bit)

Windows 10 Professional/Enterprise (64-bit)

Windows Server 2008 R2 SP1, Server 2012 R2, and Server 2016 (64-bit)

Classified as a Class A product (standard stock item)

This product was officially discontinued without replacement as of October 1, 2024.