Because qt-opensource-windows-x86-5.15.2.exe bundles the Qt libraries but not always the compiler , you need to handle it manually. If you selected MinGW 8.1.0 32-bit during install, the compiler exists at: C:\Qt\Tools\mingw810_32\bin\g++.exe
Thus, represents the final offline, no-account-required, binary open-source release for Windows 32-bit. Part 2: Why Use Such an "Old" Version in 2025+? You might ask: "Why not just use Qt 6?" qt-opensource-windows-x86-5.15.2.exe
QApplication app(argc, argv); QLabel label("Hello from Qt 5.15.2 on Windows x86!\nThis is a 32-bit executable."); label.resize(300, 100); label.show(); return app.exec(); Because qt-opensource-windows-x86-5
#include <QApplication> #include <QLabel> int main(int argc, char *argv[]) represents the final offline