Couple of weeks ago, after re-installing Opera, was having the same issues as others getting "Install Google Extensions" to work.. After adding it to Opera there is no "install" button and the google icon is grayed out. The tried crxextractor.com as suggested by @djmartist and it worked perfectly. Today I'm trying to install another app and crxextractor is not working. The home page opens but when I click the "ready" button nothing happens. It is supposed to open a dialog box to enter the url at the chrome store for the app you want to install. Anybody else experience crxextractor not working and/or found a work around to install from the chrome store? Thanks!