This is a note on how to bypass the account login requirement in the Qt open‑source installer, based on:
https://www.openguru.com/2021/03/install-qt-creator-without-qt-account.html
First, download the Qt offline installer here: https://www.qt.io/offline-installers. During installation you will still be asked to log in. On Linux systems you can set an invalid proxy as described in the reference link. On Windows you can disable the network connection to skip the login.
This way the installation proceeds without requiring a Qt account.