By providing information on each program (name, category, download link, target directory, etc.), you can get the new version downloaded as soon as it's available.
You can check for updates manually, or activate a check for whenever you initiate a program.
Ketarin's interface also lets you review the list of programs and organize them by category, last update, or by progress made in downloading the newest version.
Another useful feature is the possibility of importing and exporting the program list, so that you'll have a backup copy in case the original is lost.