The Qt Online Installer as well as the Qt Maintenance Tool do currently miss a dedicated manual. There is some information in the Qt Installer Framework manual, and some information spread over different documentation projects. But there is very little to no documentation on common questions like selecting a mirror, fighting dependency problems on Linux ...

Possible structure:

• Where to get the latest Qt Online Installer
• Network options
  • Selection of proxies
  • Selection of mirrors
• Getting older versions
• Command line interface
• Frequently asked questions