Hi,
I've found a solution tested.
Download the .Rar or .Zip file, extract the folder inside.
Go to Opera Extensions, Developer Mode > Load Unpacked Extension > Go to the folder extracted and that's it
https://www.dropbox.com/sh/l2qxh1d6ry0y6eq/AABKWN8V1a56TDYhN68Aa_Uxa?dl=0

It really works! Thanks!!!!!