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] HD video washed out on windows version
The clips when I finally download them to a windows machine are too bright. I think I need to make different versions for each platform but I'm asking what's the smallest change I ought to make to keep the quality as high as possible. Gamma, exposure, contrast/brightness?