CCDciel is free software released under the terms of the
GNU General Public License
CCDciel can run on a recent version of macOS, the minimal version required to run the program is 10.10 Yosemite.
You can download the CCDciel dmg installer from the Sourceforge download link. Open the dmg file and run the installer.
See also the list of the optional dependencies to install to take full advantage of the software.