For pvrx2 the plugins are installed in a subdir of the plugins-dir now. E.g you could install the weather plugin in gbpvr\plugins\weather. etc. etc.
For gbpvr they should be installed in the plugins-dir directly. Just copy the contents of the sub-dirs into the plugins-dir.
Edit: you might want to check the version of the plugins, what version of gbpvr they are compatible with.