There is no virus in that installer. Your antivirus software is incorrect. We've seen reports like this in the past because there is a computer virus called Blackhole. Here’s what wiki says: https://en.wikipedia.org/wiki/Blackhole_exploit_kit You'll need to temporarily disable the antivirus software if you want to install the plug-in. Sorry for any inconvenience.
I just purchased Blackhole. When I installed it I got the following message from Bitdefender anti-virus:
The file c:program filescommon filesavidaudioplug-inseventideblackhole.aaxplugincontentswin32blackhole.aaxplugin is infected with Gen:Variant.Renos.41 and was moved to quarantine. It is recommended that you run a System Scan to make sure your system is clean.
Has anyone else run in to this?