This is NOT an accusation of malware, but a statement of fact, that it fails my security standards.
Your standards are unrealistic and probably not based on good insights in the matter.
You could run some actual AV program installers through VirusTotal, and they will likely trigger security warnings by some other AV engines too.
That will be about how the software behaves, and some companies not understanding that, and/or having outdated virus databases.
What you (and anyone else using it) should also do when you refer to VirusTotal:
Check which AV engines are the ones claiming a possible security risk.
In the case of the latest MusicBee installer,
none of the respected AV companies are reporting a problem.
Only a few (4 out 69), and those are ones I personally have never heard of.
I think you should educate yourself a little bit better on this matter to be honest.