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During the first weeks following any release of ZBrush, some antivirus software has reported a Trojan during installation. What this is usually referring to is Netcat [https://en.wikipedia.org/wiki/Netcat] (or nc.exe).  This is a framework that simplifi...
This is almost certainly Windows Defender. It has been more and more of a problem in recent months. It could be other antivirus software as well, but Windows Defender is the most common culprit. Temporarily suspend such software while downloading, install...
Some users on Mac OS X have reported that the bonus content installer for KeyShot is shows as being damaged. There's actually nothing wrong with the file -- except that certain OS X security settings don't like it. Simply change your OS X security set...