if as I am, you are heeding the request of the Luminous Landscape people to only download one file at a time, then you will probably have noticed that the page displaying the list of files for your order has a session timeout parameter and it's pretty short.
if your session has timed out and you click the Download button for the next file, you will be redirected to the 'timed out' login page. after you have supplied your login details, you are redirected to the Best Sellers page. you then click My Account, then click the View button for the order that contains the C2P files and finally click the Download button for the file that you want to download.
there is a quicker way. Don't click the Download button if you think your session has timed out. instead, reload the page. you will be directed to a different login page and after you've supplied your login parameters (which in my case are automatically supplied by OmniWeb), you will be redirected back to the file list page instead of the Best Sellers page. this saves quite a bit of clicking and time, and makes behaving as a one-file-at-a-time 'good guy' much easier.
regards,
Gregory