I've been following this thread and see one point of confusion concerning 64 bit plugins. Not all 64 bit plugins are the same. DX and VST plugins are not interchangeable. The DX plugin and VST plugin specifications were developed by two well known software companies, Microsoft and Steinburg.
DX is a Microsoft specification more commonly known as Direct X. Direct X was first developed to support audio and video in games, not the audio community. Very few DX audio only plugins have been developed and no DX plugins have been recently developed as far as I'm aware. Few music application developers support the DX plugin specification; but PG Music does.
Steinburg developed the VST plugin specification. The VST plugin specification was widely accepted in the audio community and is supported in most music applications. PG Music products support VST2 but not VST3.
Because PG Music products support both DX and VST2 specifications it is easy to treat them as interchangeable.
But when troubleshooting a DX issue the first thing I would look for is what DX versions are available. If your PC doesn't have the right version of DirectX installed your application might not work properly. PG Music support should be able to tell you what DX version you need.
+++ HERE +++ is a Microsoft Support link that details how to find what version of Direct X your operating system has access to.