How do I Install VST's?

RPM looks in 2 places for VST's:

First it looks at the registry as When installing VST plugins with setups, they usually use a common place for all plugins so all apps can see them, however not all plugins follow that standard.

The Second Way is to make a folder called "vst" in the RPM Directory, the default directory is C:\Program Files\RPM

So your new folder path would be C:\Program Files\RPM\vst

Then copy the VST .dll into the vst folder and it will show up in RPM.