There is no AV that is immune to false positives. It’s just how they handle the file in question that separates the good AVs from the mediocre. In cases like this, where the files are paid for items from a legitimate company and their own servers, the chance of it being a false positive is very high. Like Richard said, a second opinion with an on demand, as opposed to a resident scanner is best.
MalwareBytes is a good one. Another, is ClamAV…over at portableapss.com there is a version of it to stick on a USB memory stick/pen drive. And you run it from there, when you need it.
But ANY antivirus is only as good as its update schedule…without the most recent updates, you may as well no even bother with one.