Hi damiano64
As per the machine learning section of our manual:
https://support.brightcomputing.com/manuals/9.0/machine-learning-manual.pdf#section.1.141
"From Bright Cluster Manager version 9.0 onward the activation step via a wizard is not needed—the repository is automatically available and enabled."
After installation of Bright 9.0, the machine learning packages are automatically available from the Machine Learning repository.