PST V4.2 is free software. You do not need a license key or a Siemens service contract to download or run it. However, because it is a free legacy tool, Siemens does not provide technical support for its installation or operational issues. Any support must be community-driven via Siemens forums.
If you need help resolving a specific error or finding the exact software page, tell me: What are you trying to run the tool on? Siemens Primary Setup Tool V4.2 Download -UPD-
: Assigning or changing PROFINET device names to ensure correct identification within a network. PST V4
Mira remembered hearing about the — a lightweight utility (only ~15 MB) designed for exactly this: quick device discovery, IP assignment, and basic parameter read/write for Siemens protection relays without installing full DIGSI. Any support must be community-driven via Siemens forums