Image sounds don't appear in Cubase 13 Mediabay / right zone

I have purchased, downloaded, installed and registered the Pro Percussion Bundle from Steinberg. Everything looks correct in the Library Manager, and even when I double-click one of the associated vstsound files in the Finder, the Library Manager says that everything is registered. Nevertheless, nothing from Pro Percussion Bundle appears in Cubase 13 Mediabay or in the right zone. Other image sounds (e.g. Funky Guitar 1 & 2) appear and can be used normally. The product is also activated in SAM. What am I doing wrong?
Thanks for your help