If you want, I can provide direct links to the official Qt 5.15.2 archive downloads for a specific platform (Windows/macOS/Linux) — tell me which platform and toolchain you need.
If you prefer using the official online installer to build your own offline package: download qt 5.15.2 offline installer
Using the offline installer for Qt 5.15.2 binds you to the GNU Lesser General Public License (LGPL) version 3 or the GNU General Public License (GPL) version 3. If you want, I can provide direct links to the official Qt 5
Because 5.15.2 is open-source, no license key is required during installation. Simply click "Next" through the wizard. If you prefer using the official online installer
Follow this exact path to ensure you retrieve the correct file without getting lost in the Qt directory tree.
Open your browser and navigate to:
https://download.qt.io/archive/qt/5.15/5.15.2/