NMI Plugin 4.3 to 4.6

I see there's already a NMI plugin on github (v4.3), how does one go about updating that to 4.6? I'm new to nopCommerce.

https://github.com/nixtus/nmi-plugin-for-nopcommerce

Thanks

If you're a developer, then you can get the source code from GitHub and "upgrade" it in Visual Studio.   Or, you can have a developer do it for you.
Possibly it will only need to "Rebuild" (and change version # in the plugin.json file). But it may require some refactoring to be compatible with any changes.  (And, it's possible that the NMI API has changes too.)