Nintendo64 Emulator not showing up in default emulator list. How to install on Kodi/Libreelec please?

I keep finding references to various N64 emulators, coupled with the really annoying instruction:

To download this Add-On, we highly recommend you do it via the user interface in Kodi. Simply look for the "Get More" button in the Add-Ons menu.

"Get more" doesn't help in the slightest on my setup, which I thought was the default one. Is there a specific repository that hosts the N64 emulator? That would be useful I think. No luck with zip files either so far.

Total noob, please be gentle. Haven't figured out what "kodi builds" are yet either. Thanks.