Hi Marcello. I have to say that is not actually a replacement for corpus-based concatenative synthesis programs at all.
It was mainly an experiment trying to mimic what you can do with the Freesound quark (content-based similarity search) but with your own sounds. It involves using Essentia and Gaia, which arte C++ with python bindings, the best way to install those is using docker (
https://www.docker.com/).
That being said, you are right, the actual SC file was missing! This has been fixed.
At this point, however I would rather recommend using the KDTree quark for similarty search. Essentia outputs descriptors in YAML, which is easily parsed with parseYAML. So that would still require getting or compiling an Essentia extractor program or using some other means to produce descriptors (there are actually quite a few UGens that you could use, such as MFCC).
Or, if you have time, as PA says just wait and watch this space :)
...
gerard