1. Don't have a Qt version in PATH.
2. Start Creator with empty settings, e.g. by passing the parameter -tcs.
   Creator will automatically configure a kit for each found compiler, but none of these will have a Qt version.
3. Start creating a new Qt Widgets Application project using the wizard.
4. In the wizard, proceed to the "Kit Selection" page.
   All the kits are listed, but all of them are disabled, because without a Qt version they are not suitable for this kind of project. You are not able to add a Qt version, though, since the "Manage..." buttons are disabled as well:
   

Either each kit's "Manage..." button should be enabled, or the global "options" link should be shown like when there are no kits at all.