website software download for customers

I need a better solution for customers to download PC and Mac software from our website. We currently use dropbox and it is not working well. Here's what I would like: 1. Email request before downloading (collect email before downloading software) 2. Direct download (click a link and it downloads the software. No other steps.) 3. System to monitor downloads and provide a report including date and time of download, ip address of downloader, software they downloaded, email address they provided. 4. Send email when someone downloads software including details from #3. Please provide the application you intend to use to accomplish this with your bid. Also, please include any costs of that app (up front and recurring). Thank you for your interest.