STEP 7 V5.4 was a milestone release. It arrived during the transition period when Windows Vista was new and Siemens was preparing the market for the S7-1200 series (which would use TIA Portal). V5.4 was the last fully stable version for many classic Windows systems.
Once you have a genuine DVD or ISO (downloaded via your Siemens account), follow this procedure. Note that V5.4 is finicky on modern hardware. siemens step 7 5.4 download
If you have a valid license, log into Siemens Support. Search for "HSP for STEP 7 V5.4". The last HSP version compatible with V5.4 is from 2012. Newer modules (e.g., CP 343-1 Advanced) require V5.5 or higher. STEP 7 V5
Modern antivirus often flags legacy Siemens installers as suspicious; disable it temporarily. Once you have a genuine DVD or ISO
STEP 7 V5.4 is picky about its environment. It was designed for a different era of computing.