J'ai contacté Richard Sanders pour le même problème.
Voici sa réponse:
Unfortunately the platform that the tutorials were hosted on went out of business so I moved all files to a direct link.
I am in the process of notifying all previous owners of the change as well as updating all the products.
Obviously there were some products that just recently sold that were unable to be updated.
So I am thankful that you reached out to me directly so that I can help you.
Here is the new file location…
You will find your instructions here: https://vimeo.com/xxxxxxxxxx
This is your password: xxxxxxxx
If you have any other questions, please let me know.
So sorry for this inconvenience.
Have a great day