Dear Madam/Sir,
As per your brief, it looks like you want the followings:
1) All pages will need authentication to view.
2) In each secure pages, there will be some documents uploaded by admin.
3) Authenticated user could only download the document at zip format which will be created by merging all the files selected by user.
Here, I need to discuss with you regarding full functionality.
Please ping me and get the best result.
Exact time and cost will be given as soon as we will discuss in details about project.
Thanks & Regards,
Ranjan Kamila
Project Manager