Even if you find a "working" crack, it often:

The is the mandatory tool for handling Siemens license keys.

The "Professional" edition is critical because it includes the full suite: S7-SCL (Structured Control Language), S7-GRAPH (Sequential Function Charts), S7-HiGraph, and S7-PLCSIM (simulation software). The non-Professional or "Standard" license lacks these advanced languages.

Surprisingly, Siemens still sells Step7 V5.5 licenses, though it is officially in "phased-out support."