I'm attempting to use the Download URL with a custom button in another web page to download a file from the repository

From the Help file (Download): https://ServerName/laserfiche/electronicfile.aspx?db=dbName&id=EntryID&mode=Export

This works and does downloads the file but the challenge is when the download is complete, instead of closing the tab, it displays the following.

Our preference would be to have the tab close automatically on completion, or if it had to stay open to not provide the link back to the webclient.

Thoughts?