Restoring a model is not as simple as running a few programs and you have the original project. This is often called reverse engineering, where you take the packaged model files and disassemble them into a bunch of textures, shaders, and gameobjects. Next you need to manually fix them like building blocks. Luckily, now github has a tool that can help you through a lot of the steps and save you time doing these things manually. But there is currently no perfect tutorial describing how to use this tool, and we currently don’t have the free manpower to record a tutorial of our own.
In short, there is currently no program where you can push a button and instantly get the original project files, and the steps to repair may be different for each model (just one more or one less step). I suggest you search around for FACS_Utilities.