Verison 6.5.3 Malware Detected.

We recently downloaded the latest version 6.5.3 from this site. As soon as we tried to install our AV software detected malware attempting to connect to 85.239.52.99 from the files being installed. Is this download infected, or is this a false positive. When checking the IP address several sites on the internet say it is malware.

Our installers only connect to our website winscp.net (88.198.21.111).
Make sure you download WinSCP from:
https://winscp.net/eng/download.php
Click the green "DOWNLOAD WINSCP" button.
Although we fight it as we can, Google still allows malicious ads. Maybe you've followed such ad, instead of using the actual "Download" button.

I also tried to install the latest version and it failed and now zgin.dll in being reported as malware.

@tonyl: There's no zgin.dll in WinSCP or its installer. Make sure you have downloaded WinSCP as described in my previous post.