Hi @filsdegraphiste,
The links under the youtube video from Donnovan have been broken after updating Cineversity. I've contacted the Web team, they are working on it. As of today it looks like the links have been fixed (e.g. here is the link to the CV-Parametric selection tag tutorial on the Cineversity portal). However, it also looks like the project files are still broken. It might take the Web team some time to recover them completely.
The CV Toolbox in turn is available on downloads page under "Cineversity Legacy Downloads" section.
Cheers,
Ilia