Background
When you download Qt files, either by clicking on the links at http://qt-project.org/downloads or by using the Online installer, the qt-project.org servers selects a mirror for you based on your location.
Issue
Some users (especially from the Asia-Pacific region) are getting assigned unreliable mirrors. This leads to extremely slow download speeds and frequent disconnections.
See http://lists.qt-project.org/pipermail/interest/2013-December/010336.html for a few examples.
Workarounds
There are a few ways to get around this problem. Here is a list, ranked from simplest to hardest.
Click the “Info” link next to the package you want at http://qt-project.org/downloads , and manually select a mirror for an Offline installer. If the download is slow, cancel it and select a different mirror.
If you have a download manager, use it to download an Offline installer from http://qt-project.org/downloads — it should be able to use all available mirrors.
If you really want to use the Online installer, Tim Jenssen at Digia has provided instructions on how to set up a repository on your local hard disk and point it to a specific mirror of your choice. Download the sample repository from http://lists.qt-project.org/pipermail/interest/2013-December/010341.html (attachment_0001.obj), rename it to qt_for_windows_from_mirrors.ustc.edu.cn.7z, and follow the steps in the same email.
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