https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=538294
you need to have sync enabled in Preferences in the Plugin, select the track in the plugin, hit the Play button in the Plugin then play in Reaper.
Also keep the vst window open in Reaper or the audio will stop, this is a bug that will be fixed in the next release.
The Plugin needs an easy sync method that users will understand:
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=538316