If you haven't had any problems other than it popping up the thing telling you to downgrade/upgrade then go into the radeon settings window and click on preferences at the bottom. If its not at the bottom then click the little house on the bottom left of the screen. Then click preferences and uncheck the box for notifications and then click on the notifications button on the bottom and delete any notifications it has there for downgrading/upgrading.
This should make it so it won't bother you and if you really want to get new drivers you will be able to check on your own if there are new ones instead of waiting for the computer to pop up the window telling you.