Whenever I add a new script to any of my nodes the only language I can choose in the dropdown menu is GDScript. According to the documentation there should be C++ and C# available additionally from scratch.
How can I add further language options for my existing project?
I'm using Godot 4.1.3 on MacOS 14.1.1 (M2 Chip).
Seems like you downloaded the default package, instead of the mono version. C# is only supported with the mono version. (Can't say what happened to C++ though.)
The Mono version can be found here, in the "all downloads" section.