If you have modified any of the theme files, these changes will be overwritten when updating, make sure you have a backup copy of the changes and make the change again to the new version of the file after the update.
1. It’s recommended to back up your site before upgrading.
2. If you’ve modified any of the theme files, make sure to backup those files. Updating the theme will overwrite any changes you’ve made to the theme. If you are using the Storm Child theme, and update the parent Storm theme, any changes you’ve made to the Storm parent theme will be overwritten. Any changes made to the Storm Child theme will be kept.
3. Download the latest version of the installable WordPress theme from the ThemeForest Downloads page.
4. Log in to the WordPress admin and go to Appearance → Themes on the WordPress menu and click the Add New Theme button then click Upload Theme, choose the zip file downloaded in Step 3 to upload the theme.
4. WordPress should say that the theme is already installed. Click the button Replace active with uploaded to install the new version.
5. Go to Appearance → Theme Options and click Save to regenerate the cache.
6. (Optional) If you’ve modified any files, make the modifications again to the updated files.