Many users use the exact same SquareLine Studio 1.4 zip-file and we don’t have a single complaint yet about viruses in it. From this we conclude that you might have some setting differences in Defender on your PC that might need retuning. Reading/googling a bit about this Vacatac.B!ml seems to reveal it’s really an existing trojan virus but Defender tends to give false alarms about it sometimes. Even Microsoft seems advising using some other scanners that could confirm/deprove if this is a false positive.