Now, it seems that the latest version of Step 7 PLCSim (for Step 7 v5.5) is PLCSim v5.4 SP8. You can download a trial version, fiully functional for 21 days, from this link. After the runtime period is over, if you want to continue using it, you are expected to purchase a license for the software.
S7-plcsim V5.5 Download
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