Step 1. Download the theme archive from ThemeForest.
Step 2. Head over to Appearance → Themes in your WordPress dashboard.
Step 3. Click the Add New button on the top of the page followed by Upload Theme.
Step 4. Locate the .zip file you extracted from the ThemeForest download archive and click the Install Now button.
Step 5. Select “Replace Current with Uploaded” as shown below.
After update the theme, you’ll see a notice in your Dashboard asking you to install or update a few plugins.