Hi @Methtical. Check if the VST2 is installed on the correct folder (C:/ Program Files / VSTPlugins /, if you’re on Windows). Then go to Reaper > Options > Preferences > VST, make sure that Reaper recognizes that folder, press Clear cache/re-scan, Apply/Ok and restart Reaper.
That should make it appear under the VST tag. If it still doesn’t show up after that, close Reaper, uninstall the Plug-In, and reinstall it with the exception of adding a subfolder containing it (example: C: \ Program Files \ VSTPlugins \ “Custom Folder Name” ).
Re-scan your Plug-Ins and check if the issue persists.