Since jModelica website is down, the FMILibrary link is unavailable for download. I don't know how long it has been down for, but an alternative source is:
https://svn.jmodelica.org/FMILibrary/tags/2.0.2b3/
This is for the specified release in the installation instructions. Download with SVN.
Since jModelica website is down, the FMILibrary link is unavailable for download. I don't know how long it has been down for, but an alternative source is:
https://svn.jmodelica.org/FMILibrary/tags/2.0.2b3/
This is for the specified release in the installation instructions. Download with SVN.