sape.Heur.5b67

I'm not too happy right now. Norton said I have Sape.Heur.5b67, which is a high threat. The problem is the two files it removed are a licensed program I bought and paid for and downloaded from a trusted source. I've downloaded previous versions of that software from this company and have never had any issues. It is a worldwide known company for music composition. So is it really infected or is this a false positive? I've had no issues with my system at all. I transferred the file to a different system and that's where I installed it.