Greasy Fork

I want to download a Vietnamese subtitle but it only shows up when I change the country to Japan (jp) and the tool doesn't show download button

Some example link? Also, I don't have a subscription so if it doesn't work without an account then I can't test it.

yes, here it is: https://tv.apple.com/jp/movie/no-way-out/umc.cmc.7ksmle5q853aazf5avhn51knb

There's no download button because it's not in iTunes catalogue. It's available through U-NEXT and Amazon. There's nothing I can do about it. I have a script for downloading subs from Amazon videos. But Amazon has a better protection so you can only download subs if you can also watch a movie.