Haxe and FlashDevelop how to still work?

To recompile? The link I posted above has latest version (2020) of both FlashDevelop and haxedevelop

Whichever of the programs FlashDevelop or HaxeDevelop it cant even find me anything when I “import openfl” before main function and doesnt recognize anything, something is not set. As I describe in the other thread