[Envato API] Downloading purchased items (Installable WordPress file only)

When downloading purchased themes from Themeforest these are the top dropdown options when clicking the green Download button:

  • All files and documentation
  • Installable WordPress file only

However when we download purchased items using the Market API Buyer Download call, we always receive a download link for the first option (All files and documentation).

My question is: How do we download “Installable Wordpress file only” using the API?