I've seen that with both earlier versions of deim's software and other programs. IIRC it has to do with the way the program is packed/runs. IMO it's MWB being a little too over-cautious (actually I think it was Windows itself that quarantined deim's program for me). There are plenty of legitimate programs that evidently fall into this category. I had to whitelist "UnidenWavPlayer.exe" and then make sure to rename the updated executable (removing the version number etc from the filename) every time I updated the software.