At the present time, iScreensaver Designer 5.2 provides support for macOS 10.13 High Sierra, but there are some functional limitations.
Please read the 10.13 High Sierra Tech Note
as well as the Release Notes
Due to changes made by Apple, iScreensaver Designer version 5.2 does not currently support macOS 10.14 Mojave.
Please read our forum post
for the latest updates.
[Solved] Video Content Not Playing
Just compiled a screensaver for both Windows and macOS but ran into an issue with video playback. I have a MP4 added and works fine on the Mac version but on the machines I'm testing running Windows 10 the screen is just blank. You can preview the screensaver and the video plays but when the machine goes to sleep the screen remains blank.
Any insight would be greatly appreciated.