Anyone have Massey Tapehead AU working in Reaper?

I've tried installing Tapehead twice, once by just copying over the AU from my old drive, and once by downloading the the "official" version of the AU (which Massey seems to no longer host), but the plugin is not showing up in my FX list. I am sure the path is correct (HD/Library/Audio/Plugins/Components), and have tried rescanning from within the FX window. Other AU's that I added at the same time showed up. Is this plug just not compatible with Reaper, or is there something else I should try? I used the paid version of this plug a ton in ProTools, and would love to have it in Reaper. Thanks!

Update: got it working on my work computer, so at least it is Reaper compatible. Still need to figure out why it doesn't show up in the FX list at home though...

New AU's don't get scanned here when Reaper is open, so I install all plugins while Reaper is closed. The free Tapehead Medium works fine on my system. Could you have a 32-bit vs 64-bit mismatch?