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] Screen saver will not work when copied to C:\Windows\System32 on WIndows 8/10
We are running into an issue with a screensaver which has be created with iScreensaver. It works great if the LIBS and SCR file are copied to C:\Windows. But when it is copied to C:\Windows\System32, we receive an error stating "Unable to open data file. File is corrupt or missing".
I have copied the exact same files to both directories multiple files with the same results. Should the screensaver run from the C:\Windows\System32 directory?