There are 1 previous version of this script.
// ==UserScript==
// @name Install Enabler
// @description Enable the "Install" button for extensions in Google Chrome for Mac
// @include https://chrome.google.com/*
// @match https://chrome.google.com/*
// ==/UserScript==
(function() {
d = document;
x = d.getElementById('cx-page');
x.className = x.className.replace(/cx-cannot-install/,'');
x = d.getElementById('cx-install-link');
x.setAttribute('href','https://clients2.google.com/service/update2/crx?response=redirect&x='+encodeURIComponent('id=' + (''+location).replace(/.*\//,'') + '&uc'));
x.removeAttribute('onclick');
})();