We use Pulse Downloader for large downloads. It is a separate company www.pulsedownloader.com where you have to create an account and download their app. Later you use our license code you got via email. This code is only for downloading our products. Pulse Is safe and used by many developers.
Please make sure to select an empty folder to download your purchase. Pulse Downloader will erase anything inside the selected folder.
If the app says your product  is being used by another user please contact us so we can provide a replacement code. Fill the info from the contact us with your order info.  Any issues regarding Pulse Downloader installations, file management or tech support will have to be addressed with Pulsedownloader.com support as they are the developers of the downloader app.