This usually refers to themes created by a specific designer in the desktop customization community. Because these are community-created items, here is how you can safely find and download the file:
Media: Older ZTH files may be associated with DivX Connected Themes for media players . zth theme file download hot
Once you’ve secured your download, the installation depends on your platform: For Windows (UltraUXThemePatcher) Download the ZTH .theme and folder. Move the files to C:\Windows\Resources\Themes. This usually refers to themes created by a
: A popular dark-mode focused theme designed for a sleek, modern look. Alpha Light Theme modern look. Alpha Light Theme