If you post what virus scanner you use, Insidious can report it as a false positive and get that fixed. IIRC he had a problem with this on AVG when he switched to Python 3.6 for coding the installer.
The Black Mages did the following FFVI tracks:
The Decisive Battle
Dancing Mad
The Opera (Darkness and Starlight / Maria and Draco)
The Decisive Battle and Dancing Mad are included in the installer under OTH, for the Opera... See my next post.
The other OTH tracks are either a few good single-track remasters (rather than them remastering the entire album/soundtrack), or in one or two cases one of the existing tracks that I fiddled around with enough to warrant keeping separate rather than replacing (an example would be the Phantom Train's OTH track is the SSC track with train effects added in, so you can hear the train moving on the tracks the entire time you're on the train, really enhances the immersion).
I was using avast free antivirus.
I have basically installed the developer recommended files with dancing mad and decisive battle under OTH.
3 Issues I have found so far.
After the Sabin intro scene the music swapped back to the spc track untill I left the room.
During the Phantom train exit the music kept playing.
I remember it being silent while Cyan mourns the loss of his family.
When I recruited Shadow in Cohlingen after Battle of Narshe, I slept straight away and the town music was still playing in the background
while the 1st dream sequence was happening.
I'm doing the opera tonight. I'm going to record it and upload to youtube to see if it is all good.
The rom I'm playing is dancing mad with Brave New World 1.9.0 patched over the top, with some additional changes.
But it still appears to be working mostly fine.
Also if you are interested, I have recorded the intro and ending scenes from the ps1 version. I think I have converted them correctly to msu1 files, but have no real way of testing (other than trying them out in zelda msu1).
If you are interested I'll see if I can upload them somewhere.