The Siemens part number 6AV6381-2BN07-4AH0 refers to WinCC system software V7.4 SP1, RC 512. 

Type: Runtime/Configuration software

License: Floating license (software and license key via download)

Power Tags: Supports up to 512

Languages: German, English, French, Spanish, Italian

Compatible OS: Windows 7, 8.1, 10 (Professional/Enterprise/Ultimate), Server 2008 R2 SP1, Server 2012 R2, Server 2016 (all 64-bit where applicable)

Delivery: Download only (email address required)

Status: Discontinued as of October 1, 2024, with no direct replacement