When downloading an uploaded file (after “Your download is complete” is displayed), one can access and use the page again for downloading if one refreshes the page.
This is also possible by navigating to an arbitrary other webpage and then clicking on the back button in ones browser.
Non-specialist users may well think that the "your download is complete" page signals the end of download activity.
Incidentally, similar behaviour is observed when accessing but not using a voucher, although there the workflow messaging doesn't signal "session closure" quite as strongly.
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