Well, probably Reaper is most likely checking the Steinberg plugins, and you don’t have the license key for them plugged in.
Remove the plugins from the folder Reaper is looking for them in, or change the VST Plugin path in Reaper so Reaper doesn’t see them.
Yeah, it was thought that computers would make our lives easier back in 1971, but they’re still figuring out how to make that happen. 