How do I update to the latest version of the theme without undoing all my work in the previous version?
Download the latest version of the theme from your ThemeForest account, login and then click on “Downloads”.
Always backup your site and database before performing an update.
Now, assuming that you haven’t modified any of the theme’s files, you can simply drag and drop in your FTP client the latest unzipped version over the old one to overwrite the files. That way if you have uploaded any images under sliders, etc. they will not be deleted.
Now if you have modified files like CSS or some php files and you haven’t kept track of your changes then you can use some ‘diff’ tools to compare the two versions’ files and folders. That way you’d know exactly what files to update and where line by line. Otherwise you’ll loose your customizations. A couple of compare tools are ‘Beyond Compare’ (http://www.scootersoftware.com/) for PC and Changes (http://connectedflow.com/changes/) for MAC that even allow you to merge the changes into yours.
NOTE: If you’re updating from a version of the theme older than 1.3.1 and using Piecemaker slider, you will also need to re-upload your slider images after the update and then purge the cache and “hard” refresh the page in your browser. This is necessary because the Piecemaker slider has been changed in how it handles images in version 1.3.1. So, make sure you have your slider images backed up before doing the update.