Qt 5.15.2 Installer [portable]

Here’s a short, interesting report on the Qt 5.15.2 installer — focusing on why it stands out in the Qt ecosystem.

📄 Report: The Curious Case of the Qt 5.15.2 Installer 🔍 Context Qt 5.15.2 was released in November 2020. It is the last open-source (GPL/LGPL) version of Qt 5 that can be built and used freely without a Qt commercial license — but with a catch. 🧩 The "Installer" Story The official online installer for Qt (maintained by The Qt Company) does not provide Qt 5.15.2 as a pre-built binary for open-source users by default anymore — unless you have a commercial account or a Qt for Small Business license. Instead:

Open-source users downloading the Qt Online Installer today will not see Qt 5.15.2 in the list of available packages (only LTS versions like 5.15.13+ under certain restrictions). To get 5.15.2 pre-built , you must either:

Build it from source (official tarballs available). Use a third-party distribution (e.g., aqtinstall , vcpkg, Conan, or Linux distro packages). Have a commercial license. qt 5.15.2 installer

⚠️ Interesting Quirk Many developers still believe the Qt 5.15.2 installer works like older Qt installers. In reality, The Qt Company changed the installer behavior in 2021:

"5.15.2 is open-source, but we will not ship pre-built binaries in the open-source online installer."

🛠 Workarounds That Became Popular

aqtinstall – a Python CLI tool that downloads any Qt version from Qt’s mirrors, bypassing the official installer’s restrictions. MaintenanceTool – if you had Qt 5.15.2 installed before 2021, it remains usable, but reinstalling it cleanly is impossible without source build or third-party tools.

🧠 Why It Matters

Embedded & legacy projects that rely on Qt 5.15.2 as a stable LTS base are forced into either: Here’s a short, interesting report on the Qt 5

Sticking with old offline installers. Switching to Qt 6. Using unofficial scripts.

It marked a turning point: Qt’s open-source installer is no longer a reliable archive of all old Qt releases.