Every time a transaction is closed in Brokermint a zip archive file is sent to the owner of the Brokermint account (link expires after 7 days). If that link has not been getting used, you can request this link manually by going to the transactions Documents screen, clicking Action button -- Download All. Wait a few minutes and you will have an archive of the whole transaction in your email.
Next, click the Request download link button to receive an email with the link for the archive.
Once the email comes in, click Download archive to receive the zip file.