If running newer versions like V4.94 on Windows 10, you must manually install .NET Framework V3.5 to open IEC 61850 devices. Conflict Avoidance:

Use the tool to import these .vdg files into your working library. Troubleshooting Common Download and Setup Issues Issue 1: "Communication Error with the Device"

This comprehensive guide provides everything you need to safely acquire, install, and configure a verified version of DIGSI 4.91. 1. What is Siemens DIGSI 4.91?