Can't find A* Library

Hello, I’m trying to find an A* Library in C# that will work correctly in Unity for an 8 directional (square node) system.
For the last 2 days I’ve been trying to implement A* into my project and have been getting stuck because I can’t find a class with all the A* Algorithms. I can only find explanations for the A* System, and no actual code I can use and it’s very frustrating.

All help is really appreciated, thank you.

Does the A* Pathfinding Project answer your question?
The free version include 8 directions Grid Graph for pathfinding. There is also an excellent Pro (paying) version with Recast Navmesh and local avoidance. Note: all the C# code source is included in both versions (Free and Pro).

It’s not what I’m looking for. I already have a system that doesn’t use grid graphs, navmeshes, or anything in that package. I need a basic horizontal 2D Grid Pathfinding.