Simatic S7-PLCSIM V5.4 SP8 can be downloaded from the Siemens website or other authorized sources. Here are the steps to download and install the software:
For many legacy projects, specifically those built on STEP 7 V5.4 or V5.5, the version remains a gold standard. This service pack (SP8) represents the final, most stable iteration of the PLCSIM line for older S7-300 and S7-400 series controllers. simatic s7-plcsim v5.4 sp8 download
If you are using NetToPLCSim to connect via TCP/IP to the simulation, start NetToPLCSim before starting PLCSIM to avoid port conflicts. Simatic S7-PLCSIM V5
