Before a hack may be released, a MOD or ADMIN has to take a look at the file, to make sure it works, and if there are any virusses in the file.
When it's waiting for approval, the MODS/ADMINS are looking at the file.
So you just wait till a MOD/ADMIN has seen and tested the file, the file will be approved and you can download it :-)
It's for your own safety ;-)