How can I restrict access to author's page for unregistered users?

More exactly, I don’t want unregistered users to see posts by accessing http://www.domain.com/author/qwerty, if they knew how to access this. I know that I can show posts from different categories, but I want some posts by some authors to be visible only if you are logged in. I already have several posts that are visible to everyone who enters the website, and then I have some posts that I want to hide, being very important.

https://wordpress.org/plugins/restrict-content/