When the Theme Updater App shows Out of the Sandbox or Pixel Union themes as 'Unsupported,' it means that there have been changes made to the top portion of the
settings_schema.json file (usually through the addition of an SEO app).
When an SEO app adds its code to this file, it gets placed above our theme information code, which is used by the Theme Updater App to identify a theme as one of our own as well as its version.
When this information code is moved, the Theme Updater App can't search the file to identify the theme or the theme version, which results in the 'Unsupported' message.
To update, you will need to remove the additional code added to the top of the
settings_schema.json file (found under Online store > Themes > Actions > Edit code > Config >
settings_schema.json ) and store it somewhere safe.
Once the theme update is complete you can then add this custom code back into the theme's