DL the file from SDR#'s page, if norton flags it when thebox pops up click on it...restore it and it will create an exemption...
most times newer,,less widely downloaded software will have a low reputation rating, meaning norton dose not have a history large enough with it to greenlight it, so it assumes its harmful to be safe vs. sorry...
happens all the time with these radio programs...I reformat once a month, to keep my system fresh & squeaky clean...I have to.. Im familiar with nortons falses...I just switched to AVG, got the same issues with
I think it was PUTTY....or GPSSK...(was programing GPS modules)....they were flagged...OK'd em and no worries...
Good Luck...