Ок.

Здравствуйте, браузер Google Chrome — расширение исправили версия 8.64
Переустановите по этой ссылке: https://ru.savefrom.net/faq.php#ext_inst_chrome
Браузер Mozilla Firefox — расширение исправили версия 8.64
Переустановите по этой ссылке: https://addons.mozilla.org/firefox/addon/savefromnet-helper/
Для браузера Opera и Yandex — расширение исправили версия 8.64
Переустановите по этой ссылке: https://addons.opera.com/addons/extensions/details/savefromnet-helper/?display=ru

We fixed this error, try to clear the cache and cookies in the browser.

Ок!

 Could you please send a few links you can't download. We will check it out.

For the better understanding it'll be great to see a screenshot with the error.

Google Chrome browser - version 8.64 fixed extension
Reinstall from this link: https://en.savefrom.net/faq.php#ext_inst_chrome
Mozilla Firefox Browser - extension fixed version 8.64
Reinstall from this link: https://addons.mozilla.org/firefox/addon/savefromnet-helper/
For browser Opera and Yandex - extension fixed version 8.64
Reinstall from this link: https://addons.opera.com/addons/extensions/details/savefromnet-helper/?display=en

Hello, Reinstall the extension after an older version is uninstalled. The current version is 8.64:

https://addons.opera.com/addons/extensions/details/savefromnet-helper/?display=en

Hello, Google Chrome browser - version 8.64 fixed extension
Reinstall from this link: https://en.savefrom.net/faq.php#ext_inst_chrome

Hello, Google Chrome browser - version 8.64 fixed extension
Reinstall from this link: https://en.savefrom.net/faq.php#ext_inst_chrome

Hello, we know about the problem, our developers find out what is the cause of the error.