Before discussing the mechanics of "how to download," we must address the elephant in the room:
Siemens DIGSI 4.91: Your Guide to Downloading and Installing siemens digsi 4.91 download
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The answer is . Thousands of substations worldwide still run SIPROTEC 4 relays installed between 2005 and 2015. These relays are built to last 20+ years. Replacing a working SIPROTEC 4 relay with a new SIPROTEC 5 relay costs $5,000–$15,000 per unit plus engineering hours. Before discussing the mechanics of "how to download,"
: The digital version usually contains the main program, but users may need to download additional Device Drivers separately to support specific protection relay models. System Requirements for V4.91 siemens digsi 4.91 download