STEP1：下载qt online installer Index of /official_releases/online_installers (qt.io)
STEP1 : Install Qt qDPass ( 12MB/s)online using domestic mirror sources
Enter the CMD in the "qt-unified-windows-x64-4.5.2-online.exe" directory downloaded in "STEP1", and then run the following command: ./qt-unified-windows-x64-4.5.2-online.exe --mirror https://mirror.nju.edu.cn/qt
The above components are installed, and the prompt needs about 16GB ; the download speed is about 12MB/s