Annoying Notification in Creative Cloud Desktop

if you're trying to control the cc desktop app notifications, open the cc app > click the hamburger menu at the upper left > file > preferences > notifications:

Gabriele, to make sure your feedback is directed to the correct location, which Creative Cloud membership are you using? Is it the one provided and managed by your organization, or does the error about Stager appear on a personal computer using an individual account?  

Please see https://helpx.adobe.com/enterprise/kb/enterprise-id-faq.html for info on how to choose the account you are signing into.

uninstall every cc app including preferences per https://helpx.adobe.com/creative-cloud/help/uninstall-remove-app.html

then uninstall the cc desktop app, again using the correct uninstaller per https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html#sa_src=web-messaging

clean your computer of cc files per http://www.adobe.com/support/contact/cscleanertool.html