Don’t panic. The photos are a great help. The top photo is the VFD motor controller with 240V main input and just below it 3 outputs going to the spindle motor (usually called UVW). The green terminals along the top are controlling the forward reverse and speed. If it comes to it you can rig something up independently so don’t worry about options on that one. Signals are either a simple switch between 2 terminals or a 0-10V supply for speed, so don’t need to make big decisions on other items just to get VFD working.

Also good news to see separate drivers. That TB6560 is common and cheap. I would send a photo of all the lights on green except the red one on the faulty driver to the seller and just say you just need a new stepper driver sending over. It might be cheaper for them to do that and get you on your way.