As the plug-in scan log revealed, the plug-ins that come with DP are not VST, but their own proprietary MAS format. This can be easily seen by going (in DP) to Edit/Preferences, then clicking on the Audio Plug-ins screen in the General section. It shows the type of plug-in in the right-hand column. It will also show, for VST plug-ins, which ones passed, failed, and were skipped during the plug-in scanning.