Open the Orders page in Theme Updater Plus to access your Order Backups.
This feature is only available for Vault subscribers. Visit the Plans page in Theme Updater Plus to select a new plan with Vault included.
Theme Updater Plus > Orders > Vault
Simply click Export next to the saved Order Backup and the download will begin.
If a download doesn't appear, check your browser settings, preferences, and extensions to confirm nothing is blocking the CSV download.