Qt 5.15 LTS (Long Term Support) is the last version to officially support Windows 7. It is a mature, stable, and powerful framework. For most commercial applications that require legacy support, staying on the Qt 5 branch is the only "safe" way to ensure your application runs without crashing. 2. Use Community-Patched Builds
The Qt Company does not provide official Windows 7 binaries. However, you can with a custom configuration that attempts to maximize Windows 7 compatibility. qt6 windows 7
Qt Group won’t reverse course. Qt7 (expected around 2028) will likely require Windows 11 or an ARM64 Windows version. qt6 windows 7