If you are getting notifications from SharedEnumerator, then your Mac is infected with adware. SharedEnumerator is adware for Mac.
SharedEnumerator changes setting in your Mac. First, SharedEnumerator installs a browser extension in your browser. Then, after SharedEnumerator hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.