[tehowell]

I tried the typical method of using the File Manager to add a source for the RMRector repo at; 

haha, that gives away users that install banned add-ons.

No that is not the way to install add-ons. That is the way piracy add-ons are installed.

1. You could go to the location I showed in the image above and click on it to install it, or
2. Add rmrectors repo via zip file, then select the add-on through his repo via Install from Repository

1. I have no add-ons except from the official kodi repo.
2. I believe I attempted what you recommend. First, I attempted to install the Artwork Beef add-on by selecting the Click to Install link in the skin's help menu, but I get this error message;

SCRIPT.ARTWORK.BEEF IS NOT AVAILABLE IN THE KODI REPOSITORY. THE RMRECTOR REPO IS NEEDED TO USE THE CLICK TO INSTALL FEATURE.

Then, as I said, I tried to install from the repo. It's still not working. I suspect the content of the repo at that url, but I'm not a programmer, and don't know what to look for.