Understanding the Qt 5.15.2 Open Source Installer for Windows
Online Installer: Open-source users must use the Qt Online Installer. Within the installer, you must select the "Archive" filter to see and download version 5.15.2. qt-opensource-windows-x86-5.15.2.exe
Open Source Users: Can use the framework for free but must comply with the Qt Open Source Model, which generally requires sharing modifications to the Qt libraries themselves or providing source code for applications under GPL. How to Install Qt 5.15.2 Understanding the Qt 5
Why is version 5.15.2 so famous? After the release of Qt 5.15.2, The Qt Company changed its open-source policy. For Qt 5.15.3 and later (in the Qt 5 series), open-source users could no longer get pre-built binary installers. They had to compile from source via the Qt Account system or use the online installer which required registration. Licensed under the LGPL (or commercial license if purchased)
download.qt.io/archive/qt/5.15/5.15.2/ (Official, but slow).Link:
Qt 5 to Qt 6 Migration Guide (cross-version, but references 5.15 changes)
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