If you want to download a sample dataset to try yourself the examples, you can retrieve sample FITS images and a catalogue here : https://seafile.unistra.fr/d/3713e2d5937747faa595/

You will also need the following .jar file to compute progressive catalogues : http://aladin.u-strasbg.fr/hips/Hipsgen-cat.jar

The examples I will show are sections 1,2 and 5 of this tutorial : http://cds.unistra.fr/adass2018/