Look at the post from Unheard - you will have to do this for every video again until the button is back, but it works.

post from Unheard:
As of May 5 2021 the button disappeared. But I found a temporary fix for it. I just looked for the div #eytd_list on inspect element and set it to display: block, then the download options finally appeared on the top left.

User Unheard, you are brilliant to provide a temporary workaround until Dishita has a chance to overcome YouTube alterations.

To those of you who just jump on here and complain about the button disappearing, spend just a few minutes looking before you create noise and you will find brilliant post like the one from Unheard that gives you a solution.

Just for that I'm not even going to tell you what the workaround is. Make the effort and look through the posts. And if you aren't tech-savey enough to use the info to do the work around, tough.... you'll just have to wait.

Update: The "Download" button is back ;)

I've used this add-on for years and have been quite happy with it. Last week the "Download" button disappeared again, but Dishita got it working again quickly.

As written by other reviewers, this happens occasionally as the author has no control over what subtle counter-measures Youtube will try next...

I use an addon for years and have paid for it. The developer fights with YouTube policy to disable any downloaders by changing the code, what sometimes makes the addon not working for a while. But be patient and just wait - so far my experience was good.

Very good

software recomended

good

Excellent downloader, simple and quick to learn how to use!!!
Edit 03/04/2024: Dishita always keeps the add-on up to date, so I've been a happy user for about 3 years.

2021年5月6日からダウンロードボタンの表示がされなくなりましたので、解決方法をmemoしておきます。画面上でマウスの右ボタンを押す＞「調査（Q)」を選択＞左下に「HTMLを検索」と書かれたBOXが有るので、そこに「#eytd_list」と入力>真ん中の「スタイルを絞り込み」の「要素」の項目に「display:none;」が表示されるまでENTERを押す＞「display:none;」の「none」の文字にマウスを当てて、「block」に変更すると＞左上に懐かしいリストが表示されます。

※今は問題なく使えますが、今後、同様の事が有った時の為に、このmemoを残しておきます

very good

I love this add

FF 88.0.1 not working anymore, no green download button anymore. Kindly fix the Problem. Much obliged

Edit Update 11.05.2021
Working again and felt obliged to get you a coffee. 😀 Many many thanks for the update
Now rated with 5 well deserved Star

edit Update 16.06.2021
Paying again? ok paid again but still NO MORE 1080 downloads. VERY disappointed feel like being ripped if not raped 🤪 not good Dude!

very good