I believe it. We supported several shareware products during the period described in the article and most of our sharewares were at some point tagged as malware

I believe it. We supported several shareware products during the period described in the article and most of our sharewares were at some point tagged as malware by antivirus programs - Norton Antivirus, most notably, but never by Kaspersky. The signatures that triggered it were in 3rd party installer code that we used. If you think of it, it is a perfect attack method as by targeting shared installer many products were made false positive with little effort.