Hey im good thanks! In the download file you'll find hospital.blend This is the blender file with all of the models. From this blender file, you can edit and export any of the models you want to use in any format you need for your game engine. fbx, obj, etc.
The models in blender do not have any textures applied to them, so you can use the textures from the folders you found to add them to the models in blender before exporting, or you can apply the textures to the models in your game engine of choice. You can also create your own textures and apply them to the models
Lemme know if this answered your question and if you've got any other questions let me know!