@manwood Are you finishing the installation in opera://extensions?
neither works, I just spent a frustrating hour trying to get it to work. Not from the chrome store or from within opera - it simply does nothing. Also, Opera is totally missing from the chrome store with the opera button or at least install for Opera - zero, there is no reference. Opera no longer exists.
This renders opera for me rather use; less than, because I started using Opera much more this past year because of the ability for certain extensions/addons. If that is no longer available,
Opera sinks back to obliviousness for me. I don't uninstall it but then only use it to test customers web sites I build. For nothing else. It is too bad because it looked like that it would once again rise to glory as it was a very long time ago.