Download
The latest version of MOPAC can be downloaded as either a graphical installer or a compressed archive for Linux, Mac, or Windows.
latest version: 23.2.4 (April 4, 2026)
| Linux | Mac | Windows |
|---|---|---|
| installer | installer | installer |
| archive | archive | archive |
This version of MOPAC is distributed under the open-source Apache 2.0 license, and the source code of MOPAC can be downloaded from its GitHub repository. MOPAC can also be obtained through several other distribution channels. See below for links to more information on how to download and install MOPAC.
Please cite its open-source release paper in the Journal of Open-Source Software at https://doi.org/10.21105/joss.08025 when using MOPAC in scientific publications.