If you cannot access the official Siemens portal (no contract, expired license), you have two legal options:
While Siemens has moved forward with DIGSI 5 for its latest hardware, DIGSI 4 remains the primary interface for thousands of legacy SIPROTEC devices in the field. is particularly notable because: Digsi 4.90 Download UPD
Older versions corrupted project databases when handling large IEC 61850 projects. DIGSI 4.90 includes a revised database engine that reduces the risk of "Project cannot be opened" errors. If you cannot access the official Siemens portal
or trial versions by searching for "DIGSI 4 software" on their portal. Note that you may need a registered account to access certain downloads. SIPROTEC Digital Grid Portal: Siemens often provides updates through their dedicated Digital Grid resources for existing license holders. Key Update Info Compatibility: or trial versions by searching for "DIGSI 4