The PureVPN application is likely being blocked due to a false positive detection. I recommend opening a support case so that the false positive can be investigated and corrected. You may open a support case by using the 'Report a problem' link in the AD360 console. The link will also retrieve a PSInfo file from the computer with diagnostic information. The following page describes how to use the 'Report a problem' link.
Juan Nakasone | Technical Support
WatchGuard Technologies, Inc. | www.watchguard.com