After an upgrade to eDiscovery Bundle 3.7 or higher, and the eDiscovery Bundle Legal Review Audit Log has been installed, the "An error occurred while downloading the matter configuration module from the following URL: Plugins/AuditPlugin.xap" error occurs.
In the previous version of eDiscovery Bundle a custom Audit Plugin from ZyLAB eDiscovery Bundle Professional Services was installed. This plugin is not compatible with the newer version of eDiscovery Bundle.
The file named AuditPlugin.xap can be removed from the location "Program Files (x86)\ZyLAB\EDiscovery\LegalReview\Review_web\ClientBin\Plugins\".
Make sure to take a backup copy rather than erasing the file so to be able to restore it if required.
NOTE: Following deletion of the AuditPlugin Legal Review client cache may need to be cleared out.