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If your goal is to operate the 3RT841B via a PLC or soft starter, here are legitimate free downloads from Siemens:
"Siemens Industry Online Support TIA Portal trial download" 3rt841b software free download
The Siemens 3RT841B is a 4-pole contactor relay (size S00) used for switching auxiliary and control circuits up to 10A. As a purely electromechanical device, it operates via coil voltage (e.g., 24V DC, 230V AC). It contains no microprocessor, memory, or communication port. Therefore, no "software download" exists for the device itself. If your goal is to operate the 3RT841B