The Download Now link directs you to the Windows Store, where you can continue the download process. You must have an active Microsoft account to download the application. This download may not be available in some countries.
From Spud Pickles:
Ghost Radar is the original application designed to detect paranormal activity. Ghost Radar attempts to detect paranormal activity by making various readings on the device. Traditional paranormal equipment can be easily fooled when simple mundane bursts of normal energy occur. Ghost Radar sets itself apart by analyzing the readings and giving indications only when interesting patterns in the readings have been made. Ghost Radar also includes a voice to let you know when interesting words have been detected. Please note we offer no guarantees of accuracy or any warranties, therefore, since results from this application cannot be verified scientifically the app should be used for entertainment purposes.