You can download HERE 
the last OpenModelica release: 1.9.6.
OpenModelica includes SystemDynamics library with World modeling. Instructions for systemdynamics World3 simulations.
Previous OpenModelica releases are available on our repository, HERE.
Nightly builds are also available, please try the last nightly build as it usually contains many bug fixes, updates and improvements.
Please choose an installation path that has no spaces in it or use the path suggested by the installer, otherwise OpenModelica installation is not guaranteed to work properly.
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