(document 3 above) + the Release Notes (document 1). These two will solve 90% of practical issues when using that exact installer.
However, the open-source archive still exists. You can find qt-opensource-windows-x86-5.15.2.exe in the official : qt-opensource-windows-x86-5.15.2.exe
(Most Useful)
While software eventually becomes obsolete, qt-opensource-windows-x86-5.15.2.exe remains a symbol of technical maturity. It represents a point in time where the complexity of cross-platform UI design was tamed into a single, reliable installer. For many developers, it wasn't just a framework—it was the foundation upon which their digital ideas became reality. (document 3 above) + the Release Notes (document 1)
REM Run the output release\myapp.exe
Since the is no longer officially distributed (Qt now requires account login for online installer), see: reliable installer. For many developers