Oh no idea, I actually don't know what you mean with CDN. The itch app sometimes doesn't work, for Windows I would just recommend installing it with the zip-file. I hope that helps!
I'm having the same problem. The install box is empty, it told me to try an alternate download method because "some regions block Itch's CDN", that didn't work, and half of my attempts keep showing an error box that says "cannot read property build of undefined". :(
Edit:
SUCCESS! Took your suggestion above regarding not using the app, downloaded it from Itch's website instead, and BOOM. Now I can play it. Much obliged! :)