download manager for site done in PHP

Hi there, I need a download manager done for my site. user should have main categories and subcategories to choose from, each category shw show total numbers of items inside example: Internet(3) and each category should have a short description (100 characters) application view page should have a screen shot, title, software type (shareware, demo, trial..) link to buy software (paypal)and description. Now, on the bottom of the product view page there should be a field or users to enter their name and email. They should not b e able to download untill they have entered this information. Now if usr chose to buy software the should be taken to paypal, complete the transaction and then given a randomized link where to download. This link shoul dbe available for only 48 hours. and finaly, ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform php/mySQL