So I see the fedex plugin page says it supports version 4.3: https://www.nopcommerce.com/en/shipping-plugin-for-fedex?utm_source=admin-panel&utm_medium=official-plugins&utm_campaign=admin-panel
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.
edit its plugin.json file to 4.30 and it will show up...
Yes, it will "show up", but when you Install it it will crash the system (DependencyResolutionException).
It's been years since one could just modify a plugin's version text and the old plugin would work in new version of nopCommerce. Recent upgrades have been pretty major, like .NET Core; but even updating support libraries like AutoFac, etc. would cause incompatibilities.
@primico The versions supported on the marketplace listing is a typo. As you've pointed out it "has a folder with 4.00, 4.10, 4.20". Many plugins have yet to be upgraded for 4.30.