How To Start

That particular video is more current than most of them. I don't think it's very different at all (it has Pool Boss in it), which was the main big difference from the older product. Yes, the UI got overhauled, but most things are still in the same positions, just more easily identified.

I don't have time to make videos anymore, unfortunately. If you can't follow the videos, then you still have the readme, this forum and the Example Scenes. I contend that most of the information in the videos is still correct though, you just have to make sure and set up all prefabs in Pool Boss, which you can do without actually leaving the spawner you're setting up (it shows up in the Inspector saying it's not in Pool Boss and you can add it with a single click).

I do on some point plan on redoing the videos, in a more organized fashion - you can see them on the roadmap. But there's a bunch of items in front of it that I need to complete first.

It's the "Levels & Waves" section. Unfortunately you're seeing the bug that there's no "Add" button there. I fixed for the next update. You can email us for the fix with your Asset Store invoice PDF, or apply the few lines of code posted in this thread:

darktonic.freeforums.net/thread/717/create-new-level