First note, in every theme package we include a changelog.txt which includes all the changes for each version. This changelog is also available in your downloads page and under each theme documentation. It’s worth reading to see if the changes made are worth an update for you and your site. Of course we always recommend to stay as updated as possible. If you haven’t made any modifications to your theme files, then you can simply overwrite your existing theme files. If you have made modifications to your theme, you will need to study the changelog to see which files need updating. You can also compare your old modified file against the updated file with any good HTML Editor or use an online tool. We’d suggest using child themes in any future theme modifications. This will save you the headache of comparing files and worrying about overwriting your modifications.
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