If you downloaded it from this site and not another one, yeah probably.
The way antiviruses work is they look for patterns of behaviour in other programs. The Phoenix launcher launches another program (daoc) which is a red flag in itself, and also modifies the way that program runs by telling it how to connect to Phoenix, another general no-no. These are the kinds of behaviours that really poorly made viruses from 20 years ago exhibit.
Basically the HEUR means it found something that LOOKS like it MIGHT be a virus. It's almost definitely a false positive.