Do not postpone the reboot. PLCSIM installs virtual network adapters and drivers. A restart is mandatory for a stable simulation.
Here is the optimal sequence for a clean, conflict-free installation of SIMATIC S7-PLCSIM V15.1. simatic s7plcsim v151 download better
Some V15.1 components require a "restricted access" login because they are export-controlled (even basic simulation). To get a better experience: Do not postpone the reboot
If you’re coming from V13 or V14, V15.1 brings solid improvements: V15.1 brings solid improvements: