I can't sideload it. It says "pdxinfo is missing".
Edit: You just made a "double zip", that's why it doesn't work. Inside the zip downloaded from here, there's a .pdx file instead of a .pdx folder. If you extract that .pdx file from the zip, and rename it from .pdx to .zip, when opening that zip, you can see the .pdx folder, and that zip is also sideloadable without issues.