I can't find SaveFrom net extension on Opera! YOUR EXTENSION IS MISSING!!!

I can't find SaveFrom net extension on opera which you said I need to add to... I am using google chrome browser. I just notice that the extension is removed and I thought I just accidentally uninstall it, but when I come to find where I could install it again and but then the site said PAGE NOT FOUND ERROR 404!!! 

URL: https://addons.opera.com/en/extensions/details/savefromnet-helper/
Problem: THE EXTENSION IS MISSING!!!
Browser: GOOGLE CHROME