You can download the videos whenever you need to, here is how:
Login (top right corner of Tutitu's website).
Go to "Store" page.
Go to "Account Maintenance" (from the left bar).
Click "view" on the order that contains your requested file.
Find the download ID from the email the you recieved after the purchase.
Go to "Store" page and click on "download area" from the left bar.
enter you Download ID and download the file.
open the email the you recieved after the purchase.
click on the download link.