Icy Phoenix

Hello, I am trying to set permissions for downloads from my site, and what I wanted to make is that the guests leave them a text, for example "To be able to access the download you must be registered or log in if you are registered"

For if I permit downloads only to registered users, the guests, not leaving them anything.

I do not know if I explained very well, I hope you understand me, and that can help me, I would be very grateful

Thank you very much in advance, greetings