((link)) Download Qt 5.15.2 Offline Installer -

| Problem | Solution | |---------|----------| | | Use a download manager or mirror site. | | "Qt account required" | Register free at https://account.qt.io. | | "Compiler not found" | Install Visual Studio (MSVC) or MinGW separately. | | Installer fails on Linux | Install missing libs: sudo apt install libxcb-xinerama0 libgl1-mesa-dev |

The source code for Qt 5.15.2 remains available to everyone. You can download the source package from the Qt Archive and compile it manually. download qt 5.15.2 offline installer