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The Qt Framework is a cross-platform application development framework widely used for developing graphical user interfaces (GUIs) and cross-platform applications. Within the Qt release lifecycle, version 5.15.2 holds significant importance as the last release in the Qt 5 series. While newer versions (Qt 6.x) offer modern C++ standards support, many enterprise and embedded systems continue to rely on Qt 5.15.2 for stability and compatibility reasons. download qt 5.15.2 offline installer