The “Demo” sample corpus has a dual function, as it generally serves as a tool to experiment with the GATTO features and functional properties, but it is also frequently used in the manual sections with most of the examples. For this reason you may want to download it even if you already have some familiarity with GATTO.
Once the "INST_DEMO.EXE" file has been downloaded, go to the directory where it was downloaded (it can be any directory) and run it.