Choose the specific compilers you need (e.g., MinGW 8.1.0 or MSVC 2019) and the modules required for your project.
Most third-party libraries and open-source plugins were built during the peak of Qt 5, making 5.15.2 the most compatible "landing spot" for complex projects. Key Features of the 5.15.2 Release
Qt 5.15 is a Long Term Support (LTS) branch. Although the open-source community edition has moved past its official support window, the code remains battle-tested and remarkably stable.
Enhanced performance for fluid, hardware-accelerated user interfaces.