[Problem solving] QT update component appears "To continue this operation, at least one valid and enabled repository is required"

1. http://download.qt.io/static/mirrorlist/ is the mirror address of qt countries, choose Chinaone of the
2. Go to the final QT directory, such as http://mirrors.ustc.edu.cn/qtproject/online/qtsdkrepository/windows_x86/root/qt/
3. Find MaintenanceTool.exe in the QT installation directory and open it
4. Click Settings-Repositories
5. Temporary Repository or User Defined Repository -- Add -- put http://mirrors.ustc.edu.cn/qtproject/online/qtsdkrepository/windows_x86/root/qt/ Just fill in
6. Click test to see if it works

Qt update component appears ("At least one valid and enabled repository is required to continue this operation")