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MOPAC has been re-released under the open-source Apache license,
and users no longer need to sign a license agreement.
Do not request a license.
Latest open-source release (openmopac@gmail.com for support): Available on conda-forge (installation command: "conda install -c conda-forge mopac")
Download MOPAC for Linux (graphical installer for Linux distributions with Qt support) Download MOPAC for Mac (right-click the installer and select "open" to satisfy Gatekeeper) Download MOPAC for Windows (click "more info" and "run anyway" to satisfy Defender) Download MOPAC for Linux (minimal tarball for Linux distributions without Qt support) Download MOPAC for Mac (minimal zip file if Qt installer has problems) Download MOPAC for Windows (minimal zip file if Qt installer has problems) Version = 23.2.2 (October 28, 2025 release)