Just keep your backup with yourself. Update theme folder and then resave all your options by clicking on Save/Update button. Have a look again it will show up just fine.
Well I tried to use this code but it says make file writable so I am pasting code here you can use this code inside footer file just below closing body tag under your child theme.
<script>
jQuery('.social_widget.widget-shortcode a').on('click', function(e){e.prevantDefault(); var link = jQuery(this).attr('href'); window.open(link, '_blank');});
</script>
Just confirm what you mean by customization ? Have you made changes in core files or some thing else like your custom settings ?
To update theme just make sure you keep backup of your website then download latest version of theme and upload to your themes folder. You can also keep that old theme as backup if any thing goes wrong you can revert back.
Kindly note, make sure you keep backup of every thing like your content and themes and plugins files. Because you are updating from version 2 to 3.4 it may lead to errors.
Kindly note you are using an older version of the theme which is not compatible with latest WordPress due to recent updates in the code base of WordPress. Make sure you update your theme to latest version and also note keep your full backup with you in case any thing goes wrong you have option to revert back.
