It usually means that once you have paid for your video of choice, it will be available for downloading for a period of five days. ie, you pay for it then you will have a period of five days to download it.
the site said that Your purchases will be available for 5 days.
what does that mena??? have i a mistake?
It means you have bought videos and you now have 5 days access to them to download them to your device. To access your videos, click on "Profile" and then "Purchases" and you'll be taken to the download page.
bidioleul gu-ibhaess-eumyeo ije 5 il dong-an aegseseuhayeo jangchie daunlodeu hal su issseubnida. bidio-e aegseseuhalyeomyeon "peulopil"eul keullig han da-eum "gumae"leul keullighamyeon daunlodeu peijilo idonghabnida.