Install screensaver

Instructions on how to install screensavers from Microsoft Windows and Apple Mac OSX

Mac Apple store screensavers - Which are the differences from a Mac screen saver?

Mac App store screensavers are different from the native Mac OSX screensavers.

Quick answer:

Always prefer the native editions of Mac screensavers, downloaded from the developer's website (outside the Mac app store). The Mac app store screensavers are actually applications that emulate the functions of the native screensavers.