AppGuard 4.2.8 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This program is an intellectual property of Blue Ridge Networks. The common filename for the program's installer is AppGuardGUI.exe. The software is included in Security Tools. The most popular versions among the software users are 4.5, 4.2 and 3.0. We recommend checking the downloaded files with any free antivirus.
From the developer:
AppGuard is for people that realize their traditional or legacy antivirus is only effective for traditional cyber attacks (i.e., old malware). Adding AppGuard protects you even when no virus signature/definition exists because AppGuard does not use signatures to protect you.
You may want to check out more software, such as Winpooch, which might be related to AppGuard.