To upgrade your theme to the latest version, you need to download the latest theme ZIP file in your ThemeForest Dashboard. Here are step-by-step instructions what you need to do:
1. Unzip the newer version on your computer.
2. Once unzipped, open the folder, and you should find another folder.
3. Copy files inside the folder to paste them into theme folder on your server. The files will be automatically overwritten.
Note, if you’ve customized your theme, then the first thing you need to do is see if the changes to the new version of your theme are extensive or not. Your theme has a “changelog” file with the changes in the newest version.