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Really great work, help a lot, THX!
According to this thread it's broken on amazon pages https://greasyfork.org/pl/forum/discussion/49613/x
Don't have account so I'm probably not going to fix it.
Until the script get fixed, you could try downloading the subtitles from Amazon using Kodi, the requested files and the steps are here.
Script should be fixed now, I added support for .co.jp but couldn't find any subs. If you can find a video on .co.jp with subtitles that can be turned on or off (so not hardcoded) send a link here.
Anyway, really thank you a lot !