For HMI and visualization tasks, the WinCC V12 SP1 download is also available separately.
If you do not have a license, Siemens often provides a 21-day trial version for evaluation purposes, typically available under the "Trial Download" sections of the portal. System Requirements & Compatibility
Registered customers can find the download for STEP 7 V12 SP1 incl. PLCSIM on the official support site.