If you are looking on places such as github, you have to download those files and run them yourself. If you don't know how to do that, try looking up a tutorial or get someone else to help you in person. But just from a quick google search, I don't see any ways to just download a complete stockfish program for fairy variants.
New variant: I need your help!

Musketeer2017, I'm sorry if you've been waiting a long time for the update. I didn't get around to it for one major reason: I'm now actually working on Version 2c.
(Namely, Dax00 has a point that a I eventually came to somewhat agree with: more turns should past before a Dragon is allowed to be hatched! In the 2c update, I'm requiring at least 1 more opponent's turn to past before an Egg is eligible for transformation. Also, I'm trying to make the game easier to learn, at least by a slight; I'm updating the powers of the pieces, so that they all are a bit more similar to each other.)
With that being said, don't even worry about the google doc above. In a few days. I will start a new thread to request testrunners for v2c. =)
Thanks for the thought, all the same, though.
Hi
I’ll wait. It’s not easy to have a good game you invent and it’s a natural process. Beta testing humanly and with the help of engines is essential.
best regards
Zied
Hey, MusketeerChess2017,
You've been waiting a really long time, and you're probably wondering where I am in V2c.
I've been on and off the project these past 2.5 weeks. Right now, I'm spending 2 days rendering this really awesome GIF diagram.
I just wanted to come back to give you a light update, just so that you're not kept in the dark; and know that I haven't fallen off the face of the Earth with this project.
It should be ready soon. Thanks for your long patience. =)
BCGN18
So, Muskateer, I was google-searching Fairy Stockfish. It lead me to these pages where I download a bunch of random files that I don't know how to open.
Where is the actual .exe application program that I can open and use?