Windows Pro Pack 8.1 32-bit/64-bit English Product Upgrade 1 License Medialess Win to Pro MC. Consists of a 25 digit Product Key Code ONLY. NO Media. PKC is a non-transferable license that allows for a single install only. Everything in Windows 8.1 plus BitLocker encryption Remote Desktop access from one PC to another connecting to company networks with Domain Join and Windows Media Center. This is a Non-Returnable sku.