HI there @Denton_Bailey
Did you manage to solve this following Chris recommendation ?
Starting from LPX 10.3 it is also a good habit to restart your Mac after installing new plugins, but in this case you just won't see the plugin in LPX until you restart ( sometime login out & in on your Mac user account works, but restarting is a good habit if you can't see the new plugin in LPX ).
In this case if it's appearing in LPX but with "failed validation" then yes, you should try several time to reset & rescan via LPX Plugin Manager like Chris suggested to you. Now to be even more cautious, do a Mac restart before.
Thank you to let us know if this is solved