Module unreachable from version 4.1.

Hello,
I have to update your ckeditor of version 4.01 to version 4.1.
Without changing the configuration file "config.js" pluging the oEmbed is not accesible in the toolbar and I can not activate it.
How do I reactivate?

For your information, I I download the new version of ckeditor customizing plugins I are needed.

Here is the config file just in case.

CKEDITOR.editorConfig = function( config ) {
    config.language = 'fr';
    config.filebrowserBrowseUrl = '/back_office/includes/editeur_texte/elfinder/elfinder.html';
    config.contentsCss = '/includes/css/style.css';
    //config.bodyId = 'left-area';
    //config.bodyClass = 'left-area';
    config.shiftEnterMode = CKEDITOR.ENTER_P;
    config.enterMode = CKEDITOR.ENTER_BR;
    config.autoParagraph = true;
    config.scayt_autoStartup = true;
    config.scayt_sLang = 'fr_FR';
    config.startupOutlineBlocks = true;
    config.emailProtection = 'encode';
    config.height = '500px';
    config.format_tags = 'h2;h3;h4;p;div',
    config.format_h2 = { element : 'h2' };
    config.format_h3 = { element : 'h3' };
    config.format_h4 = { element : 'h4' };
    config.extraPlugins = 'oembed';
    config.toolbar =
    [
        [ 'Cut','Copy','Paste','PasteText','PasteFromWord','-','Undo','Redo' ],
        [ 'Find','Replace','-','SelectAll' ],
        [ 'Link','Unlink','Anchor' ],
        [ 'Image','Flash','Oembed','Table','HorizontalRule','SpecialChar' ],
        [ 'Bold','Italic','Underline','Strike','Subscript','Superscript','-','RemoveFormat' ],
        '/',
        [ 'NumberedList','BulletedList','-','Outdent','Indent','-','Blockquote','CreateDiv','-','JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock' ],
        [ 'Format','FontSize' ],
        [ 'TextColor','BGColor' ],
        [ 'Source' ]
    ]
};

Thank you for your help