The Siemens part number 6AV6613-1FA51-3CH0 refers to the WinCC flexible 2008 Runtime software with support for 2048 PowerTags. It's a runtime license that allows you to run HMI (Human Machine Interface) applications developed with WinCC flexible 2008. This version is compatible with:
Windows 7 Professional/Ultimate/Enterprise (32/64-bit)
Windows 10 Professional/Enterprise (64-bit)
It’s a download-only product, so a valid email address is required for delivery. Siemens has marked this product as phased out since October 1, 2022, meaning it's no longer actively marketed, though it may still be available through distributors.