...
The CSG internally uses the analysisUtils and needs CASA 5.1.1 or later. CASA 6 is recommended.
Access
The ISG CSG is contained in a single Python module almaqa2csg which is part of the analysis_scripts.tar package which also contains the "analysisUtils" which you will also need since the CSG uses a few of their functions. See the Analysis Utilities CASA Guide for details on how to install the package.
...