I've found the Melodyne bridge dll. file and have tried to copy it into just about every folder in Reaper. Vst plugins, plugins, FX, ect.
I think that it should be accessed through FX add, but it never shows up on the list. All the manual shows is a picture of the interface with No Instructions on Installation.
I know it's not a tested DAW but it isn't a shabby one either. Any tips from Reaper users or others would be appreciated.