I’ve recently tried using Tiled2Unity again, but the problem is that when I export it this pops up:
and it doesn’t import anything. Is there a way to fix it or is everything outdated? I checked before, and nothing said it was outdated, especially the console.
I’m going to have to fix that warning as many people don’t seem to get it. 
You have Unity Web Player set as your build target in Unity and that is a platform that is no longer supported (it is deprecated by Unity Technologies). Press CTRL+SHIFT+B to go to the build settings dialog and choose another platform. I suggest PC, Mac & Linux.
Hope that helps,
Sean