iScreensaver 6 - managed installation - registry keys

When performing a managed installation (see https://iscreensaver.com/help/notes/managed_installation/managed_installation.shtml ) it’s important to set Registry Keys properly.
There are a few potential “gotchas” or issues to avoid:

The HKCU/.Default user is not the right place (many people think this is the “Default settings for new users” but this is not correct). See 1. https://devblogs.microsoft.com/oldnewthing/20070302-00/?p=27783
The “Default settings for new users” actually are stored in the NTUSER.DAT file - this is an older way, but can still work. See 1. https://superuser.com/questions/1285378/apply-registry-tweak-to-newly-created-users
The more modern way is to use Group Policy Object as shown here: 1. https://social.technet.microsoft.com/Forums/windows/en-US/80fad09a-420c-487f-8dfa-8a59c9ea8664/gpo-to-change-a-registry-value?forum=winserverGP

With iScreensaver 6.1, we have simplified managed installations on Windows and made changes for macOS 10.15 Catalina. Fewer registry keys and plist entries are needed.

Please see the updated instructions here: