The strange thing is, you extract the .exe from the zip, and upload that separately to virustotal and there is no problem with it.
I also ran the latest patch zip (containing MusicBee.exe 3.1.6529.34678) through virustotal and got the same results as ost.
For comparison, I also ran the last MusicBeeTestCustomImage.zip as well. It isn't flagged with any problems at all.
Could the original zip container have been made by older software and that's what giving the false positive?