The Siemens part number 6AV6613-1XA51-3CE0 refers to the WinCC flexible 2008 Runtime software. It's an upgrade package for earlier versions (2004/2005/2007) of WinCC flexible Runtime. Here's what it includes:

Runtime software with features like Sm@rtAccess, Sm@rtService, OPC Server, Archives, Recipes, ProAgent, and Audit.

Single license, with software and documentation on CD.

License key provided on a USB flash drive.

Compatible with Windows 7 (32/64-bit) and Windows 10 (64-bit) Professional/Enterprise editions.

Delivered as a set: 1 DVD + 1 USB.

This product has entered its phase-out stage as of October 1, 2022.