Screensavers built using iscreensaver designer 511 or earlier will not function normally on macos 1013 high sierra. Apple may provide or recommend responses as a possible solution based on the information provided every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums. They push out one a year, and Apple has been supporting the two previous OS major versions (Upgrades). High Sierra and any further security updates have a predictable end of support which would be when the second macOS update beyond Mojave rolls out.
Discussion in macos high sierra 1013 started by joobs333 The screen saver doesnt work on my mac pro late 2013 after i upgraded to macos high sierra 10130.
