If you are adding specific exceptions for iScreensaver Designer.app to your antivirus software, please take note:
During build, iScreensaver builds to a temporary folder, and then copies the built installer app to the destination folder (the /Installers/mac or /Installer/win folders which are located next to the ISC project file.
On macOS the temp folder has a long random name.
If you look at the build details, you will see the folder listed toward the end. It will look like this:
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Adding Module JSON
----------------------------------------
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Saving Archive
Saving Copy to : /private/var/folders/1w/bjsh07hj1g3_7x6x4m064ryw0000gq/T/TemporaryItems/iScreensaver Temp/Temp-77300306/Install SpaceDemo Saver.app/Contents/Resources/Archive/Archive.isc
An easy way to find this temporary folder is to use the Terminal and type this command:
open “$TMPDIR/TemporaryItems/iScreensaver Temp”
Which will open the folder in the Finder.
Then you can add this folder to your antivirus exceptions list.