I just downloaded these files and they work fine.
These are PSD files, most websites cannot preview them, you need to click the download button on the left side panel instead of trying to right click and save image.
Also these files do not open in Substance Painter, they only open in editors like Photoshop and GIMP.
I found it here on kemono
https://kemono.su/patreon/user/15526276/post/117120828
(I always wanted to do the link text thing, the link text takes you directly to the download)
