TinWoo is better but Awoo has a Catgirl. And since I learned the creator of Awoo is
transphobic, I decided to import the Catgirl in TinWoo.
So, to install the theme.
Insert your SD in your PC or use a FTP Server.
Go to: "/switch/tinwoo/"

[Warning: The sounds may not always play. If you want a specific background, don't forget to
rename it "backgroung.png"]

If you want to edit the sounds, delete the ones on the console 
and replace them with the one of this archive.

If you want to edit the images, delete "background.png" on the SD
and replace it with one of the images of the archive.