My wife is the OP, she’s almost a bigger gamer nerd than I am.
If your downloading from Nexus, you’ll need to install Vortex, it’s a mod manager.
Once you do, you’ll need to install the requirements which are easy to do using the Vortex manager.
Then you’ll need to install NVSE which is a script extender that’ll help/let the mods run.
Once you have those you can use Vortex to download the new DLC.
Also, read the complete description and the post for more info and people’s take on the mod.
It sounds complicated but really isn’t once you get used to using a mod manager, and there are lots of tutorials on YouTube.
Honestly, in my opinion, learn to use Vortex, there are so many mods for so many games on Nexus you’ll be able to upgrade and change the same old boring vanilla game into something new with many more quest, characters, items, and followers.
From all the Fallout series to all the Skyrim series, the Witcher, and so on.
ETA...
As far as I know, it’s only available for the Steam download version right now, though they did say it will “eventually” be available for console (XBox).