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I haven't seen the download button for a few weeks.

damn amazon changing things

It didn't work here either.
The download button did not appear.
Solution given by gru123, here:
https://gf.qytechs.cn/en/scripts/34885-amazon-video-subtitle-downloader/discussions/269675



Solution.
New xhrHijacker:

xhrHijacker(function(xhr, id, origin, args) {
if(!initialied && origin === 'open')
//if(origin === 'open')
if(args[1].indexOf('/GetVodPlaybackResources') > -1 || args[1].indexOf('/GetPlaybackResources') > -1) {
init(args[1])
.catch(error => {
console.log(error);
alert(`subtitle downloader error: ${error.message}`);
});
}
});

New parseUrl:

function parseURL(url) {
if (url.includes("GetVodPlaybackResources")){
const urlObj = new URL(url);
const urlHostname = urlObj.hostname;
const deviceID = urlObj.searchParams.get("deviceID");
const deviceTypeID = urlObj.searchParams.get("deviceTypeID");
const marketplaceID = urlObj.searchParams.get("marketplaceID");
return `https://${urlHostname}/cdp/catalog/GetPlaybackResources?consumptionType=Streaming&desiredResources=CatalogMetadata%2CForcedNarratives%2CSubtitleUrls&deviceID=${deviceID}&deviceTypeID=${deviceTypeID}&firmware=1&gascEnabled=true&marketplaceID=${marketplaceID}&resourceUsage=CacheResources&videoMaterialType=Feature&operatingSystemName=Windows&operatingSystemVersion=10.0&titleDecorationScheme=primary-content&subtitleFormat=TTMLv2&uxLocale=en_US&asin=`;
} else if (url.includes("GetPlaybackResources")){
let filter = ['consumptionType', 'deviceID', 'deviceTypeID', 'firmware', 'gascEnabled', 'marketplaceID', 'userWatchSessionId', 'videoMaterialType', 'clientId', 'operatingSystemName', 'operatingSystemVersion', 'customerID', 'token'];
let urlParts = url.split('?');
let params = ['desiredResources=CatalogMetadata%2CSubtitleUrls%2CForcedNarratives'];
urlParts[1].split('&').forEach(function(param) {
let p = param.split('=');
if(filter.indexOf(p[0]) > -1)
params.push(param);
});
params.push('resourceUsage=CacheResources');
params.push('titleDecorationScheme=primary-content');
params.push('subtitleFormat=TTMLv2');
params.push('asin=');
urlParts[1] = params.join('&');
return urlParts.join('?');
}
}

After doing that, the option to download appear.

henrique Bettencourt: Thank you so much