icradin That is the link I used to get FBX2glTF so if the version that is linked there is the latest one then yes, I have used the latest version.
Yep, if you used the link from the documentation, then you have the latest version.
…but as far as I'm aware I don't even have blender on my machine. Could that be the issue?
Unlikely… as far as I understand, Godot has its own converter. Godot, can even import .fbx[ASCII] files that Blender won't open. But you can try to install it…
I don't understand the message in the first screenshot. Did you put the .fbx in the project folder and then try to run Godot?
Have you tried importing another .fbx?
What operating system do you have?
Can you share the problem file?
The workaround is to convert the file to a different format in Maya (like glTF).