So i've looked at all the tutorials for installing custom scenery but after clicking showing package contents i get two folders macOS and resources neither of those folders have any subfolders in them.  can you please help me?

For custom scenery you normally want to put it into your style/themed folder, and if its the download thats blank, then obviously you didnt download it properly, wasn't the right download, or it was from an untrustworthy source

So i've looked at all the tutorials for installing custom scenery but after clicking showing package contents i get two folders macOS and resources neither of those folders have any subfolders in them.  can you please help me?

I'm a Mac user too.

Here you can find a tutorial on how to install custom scenery on a Mac:

https://www.youtube.com/watch?v=dKf9_LfRhTA