It would be nice if your downloads section had an option for expiration time. Setting files up to expire within 24 hrs, 1 week, 1 month or custom.
Official response
Lara Proud
Hi Brian, a file expiry can be achieved by using the Unpublish feature. On the files, you can set a date from which you would like the file to be automatically unpublished, after this point, the file will not be accessible from the Help Center and will move into the Auto Unpublished workflow. Once it has been unpublished, then your agents can then decide if it needs to be updated, reviewed, or republished.