Official offline installers for Qt 5.15.2 are strictly reserved for commercial license holders. For open-source users, the Qt Group discontinued official binary offline installers starting with version 5.15. How to Access Qt 5.15.2
Downloading the Qt 5.15.2 offline installer is a privilege reserved for commercial license holders. Open source users must utilize the Online Installer or build from source. For those with access, the offline installer provides a stable, unchanging snapshot of the 5.15.2 release, ideal for deployment in environments with restricted internet access. download qt 5.15.2 offline installer
In the component selection, click the Archive checkbox and hit Filter. Qt 5.15.2 will appear in the list under the "Qt" tree. 2. Alternative: Download Source Code (Offline) Official offline installers for Qt 5
# Linux example
wget https://download.qt.io/archive/qt/5.15/5.15.2/qt-opensource-linux-x64-5.15.2.run
Issue 5: Slow Download Speeds from download.qt.io
The main server throttles connections. Use a mirror: Conclusion
Downloading the Qt 5