itch.io

We don't know

I download it both,and there's no different between them. I think niju should make compressed and remove that original...i still dont know why niju add it both

Probably images being compressed or not. Either downscaled or converted to another filetype (webp, etc). Pretty common to do for larger RenPY games with lots of animations like this one.

The compressed file is light yk? Like from 10 gb to 5 or 3 or even 2 

and not compressed is the original file yk like the game itself but with 10gb .

Because here on itch.io you cant put games that are more than 2 gb I think and the  developers made the game compressed because its more easy 

Hope you understand