Hello, please give us more details.

According to the information sent by you, you have everything in order.

Links to the video you sent also downloaded.

Are you using any proxy server?

On the website you can watch this video you want to download?

Do you have an antivirus?

Hello.
Our extension without problems supports Google Chrome, Yandex, Mozilla Firefox, Opera 41, Opera 12.17, Safari.

Nothing has changed in order to download and watch you need a proxy server.

Hello, Thanks for contacting Savefrom.Net Support.
We can make our support more effective if you provide us information about your browser and extension.
You can find out this information on this page: http://en.savefrom.net/user.php?info=1

Please, send us links for files, which can't be downloaded.

Do you download via the extension SaveFrom.net Helper or the website SaveFrom.net?

Reinstall the extension after an older version is uninstalled. The current version is 6.80:
http://en.savefrom.net/user.php#helper_install
If you can not watch videos on Youtube you can not download it, you need to use a proxy server.

Вы прокси сервером не пользуетесь?

Может вы как то ГЕО изменили в браузере?
Почистите кеш и куки в браузере.

Hello, Thanks for contacting us.

On the website you can watch this video you want to download?

Do you download via the extension SaveFrom.net Helper or the website SaveFrom.net?

Please, send me the information listed here: http://en.savefrom.net/user.php?info=1

Hello, Sorry for inconvenience we caused. We will try to fix it ASAP.

По информации у вас всё в порядке, если мы правильно вас поняли у вас расширение на английском языке.
Переустановите расширение по этих ссылках.

Google Chrome. Сначала 1 затем 2.
1. Установите расширение Chameleon:
https://chrome.google.com/webstore/detail/chameleon/dmpojjilddefgnhiicjcmhbkjgbbclob?utm_source=chrome-app-launcher-info-dialog
2. Установите расширение Savefrom.Net:
https://addons.opera.com/extensions/details/savefromnet-helper#chameleon-install