So I see the fedex plugin page says it supports version 4.3:
However when I download the plugin, it has a folder with 4.00, 4.10, 4.20
Anyway, I took the Nop.Plugin.Shipping.Fedex folder from the 4.20 folder and copied to my Plugins directory, added the project to my solution, but I'm not sure how to install it.
I go to config > local plugins and I don't see it. I reload list of plugins and I don't see it.