In the userguide [ https://www.phpbb.com/support/docs/en/3.2/ug/adminguide/maintenance_database/]

Action: You have three options: you can both Store and download the file, saving it in the store directory and downloading it to your PC, or you can choose to download or store the file.

As of phpBB 3.2.6 the download action is not available anymore.

Also: the printscreen shows the download button.

In order to avoid confusion and avoidable questions on phpBB.com, a note should be added  in this section of the userguide stating that the option: Download has been removed as of 3.2.6.

edited to remove tons of typo's