DIGSI 4.90 is a legacy engineering software used to configure, commission, and operate SIPROTEC 4 protection relays
Importance of Digsi 4.90
Introduction
If you are looking for this software today, it is important to note that Siemens has released several more recent updates to improve compatibility and security: Digsi 4.90 Download UPD
Operating System Compatibility: Users often face challenges installing version 4.90 on modern systems like Windows 10 Pro, where driver installation frequently fails. Version 4.92 and higher are generally required for stable performance on newer Windows environments. DIGSI 4