This Installer installs a moon phase prediction program called 'Moon Phase Southern Hemisphere'. I have used it for years. I have to reinstall it after reinstalling Windows. It does NOT install any malware, not even a cookie.
It has few users because even fewer people want to know when to take pictures of the moon.
The source is http://www.tingan.com/ - He has been around for years.
I switched off SONAR to stop it being deleted. Luckily I keep it on my backup disks as well.
Henry