portal. While v4.91 is an older release, you can often find the latest version (such as ) which remains compatible with SIPROTEC 4 devices. 30-Day Trial: Modern installers from the Siemens Support site can be used as a trial. During installation, enter the term
: Enables remote communication with devices through modem or network connections. Downloading and Accessing DIGSI 4.91 siemens digsi 491 download exclusive
Windows 10 Pro/Enterprise (64-bit); Windows 7 Ultimate/Enterprise (32/64-bit) with SP1 portal