Are you sure the plugin is getting properly scanned by REAPER for VST use?
Is the VST data path properly set in REAPER VST Preferences to where you have the actual Gearbox VST .dll's located. Habe you tried "Rescan directory" or "Clear cache and rescan directory" yet? I think it is more likely a setup/configuration issue on your end that needs to be addresssed. You can always try downloading and installing the latest v3.70 update.
Cheers and good luck,
Billy Buck
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