It is possible that the download link provided above does not refer to the intended version.
If you are looking for Radia®, you may try searching for a download link using
Google.
Review
Radia® is developed by Novadigm and is used by 25 users of Software Informer. The most popular versions of this product among our users are: 3.1 and 4.0. The names of program executable files are RADCONSW.EXE, RADEXECT.exe, radntfyc.exe, radrexxw.exe and Radskman.exe. The product will soon be reviewed by our informers.