How to update installed theme? Will it change data?
First thing is to download newest theme version from ThemeForest Download section. Since you already have the theme installed, you can download just 'Installable WordPress file only'.
You need to extract theme file from the zipped folder you downloaded, and upload it to /wp-content/themes folder on your server. You will be prompted to overwrite the existing files. Select 'Yes', and the theme will update.
*The example is the zip file from Medicare theme but the process is the same for all themes.
If you made any changes in the source code you'll need to reapply them to the new version of the theme or they will be lost.
Keep your eyes on potential required plugin update messages at wp-admin dashboard once you replace the files. You should update all required plugins if the updated theme suggests so.
All settings in Customize panel and your content will be preserved.
Note: Once new theme version is online, user who purchased the theme, should get email note from the Envato (ThemeForest).
For more info and detailed instructions please refer to our Online Theme Documentation.