When cloning HEMCO you will get the
main branch by default.
$ git clone https://github.com/geoschem/hemco.git HEMCO
If you would like a different version of HEMCO you can checkout the branch or tag from the top-level directory. If you have any unsaved changes, make sure you commit those to a branch prior to updating versions.
$ cd HEMCO $ git checkout tags/3.0.0