The Siemens 6ES7658-7KX68-0YA0 is a SIMATIC PCS 7 Telecontrol OS Runtime V9.1 software package. It comes with a single license for one installation, and the license key is provided on a USB flash drive. The software supports two languages (German and English) and is executable on Windows 10 LTSC 2019 and Windows Server 2019.