I'm on Mac High Sierra. I have placed my plugins such that a typical directory path to the actual code looks like:

Vendetta.app/contents/plugins/plugin_name/main.lua

which is how installation is described in the Community Projects forum. For whatever reason, no plugin will load, despite trying everything from /lua ReloadInterface() and shutting down Vendetta and relaunching it. This install process is crazy simple so I can only conclude it's a bug... Please help!

Have you installed VO from the Store or downloaded the Disk Image and installed that way?

The Store version works differently, the plugins need to go into ~/Library/Group Containers/HKJRU99M5L.com.guildsoftware.vendetta/plugins

The DMG version wants the plugins folder to be in the Vendetta.app location, I believe. The same place where the rlb and config files are located. So I guess find the config.ini and put the plugins folder in the same place.

Ok, I didn't have HKJR.... etc in Group Containers, but I did move plugins into Vendetta.app/Contents/Resources and that worked after a lua call. Thanks for your help Ray.

Special request -- can we include these instructions somewhere in the Community Projects Plugins sticky?

I updated the sticky post regarding the Contents/Resources location.