Hello, where exactly is there no quality 720?

Describe more in detail.

Hello, tell me the name of your browser.

¡Hola! Nuestra ayuda será más efectiva si copia y nos envía información sobre su navegador y de la extensión Savefrom.Net:
http://es.savefrom.net/user.php?info=1
También necesitamos algunos links que no pueda descargar (para probarlos).
Para tener mayor idea del problema, será de gran ayuda ver una captura de pantalla en donde se muestre el error.
Esperamos su respuesta, ¡gracias por ponerse en contacto con nuestro equipo Savefrom.net!

Hello, please, send us more details regarding the problem.

Hello, thank you for contacting support in Savefrom.Net
This bug is known to us, we will try to fix in the nearby future.

Hello, unfortunately download the video through the site in high quality with sound technically not possible.
In order to download 1080p with sound from Youtube you need to install our program Ummy Video Downloader:

https://videodownloader.ummy.net

Hello, Unfortunately, we don't fully understand you... please. provide us with more details regarding the issue.

Hello, thank you for contacting support in Savefrom.Net
This bug is known to us, we will try to fix in the nearby future.

Hello, please, send us more details regarding the problem.

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

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