INSTALLATION

I recommend tinkering with horse mods manually, without the mod manager that comes with lenny's modloader. It's easier to keep track of your files that way.
You'll need Alexander Blade's Scripthook, Asi Loader and last but not least I recommend you install Rampage Trainer, if you want to use the horse(s) you've added immediately.
Once Lenny's Mod Loader is in your game's directory, you need to create a folder in "lml" and name it "stream". Here's where all your texture files will be located when replacing the ones in game.

With all these packs, you will see I've written down what horse it replaces, yet still you'll notice the name of the .ymt file is a completely different horse in some cases. This is because some of the textures are used by more than one breed, and if it's "overwritten" by multiple horses there will be complications and coats won't show up correctly.