The PDF-XChange software updates itself without asking the user if it should do so.
The software updates to a version that is not covered by the user maintenance. As a result of this, the software reverts to trial mode, and demo watermarks are added when premium features are used.
Even when the user reverts to a previous version of the software, it soon updates again to the current version - and does so without anything happening on the monitor screen or the user receiving any notifications about what's happening.
These issues are caused by antivirus/security applications such as AVG and Avast, which have recently added features that perform automatic updates for any software on users' machines that is not running in the current version of the software.
In order to resolve these issues it is necessary to go into the settings for your antivirus software and disable the setting that is automatically updating your software.
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