I installed QGIS and Qt designer using the OSGeo4W installer from the
QGIS website (02.02.2026) via the express installation.
After installation, the Qt designer does not open via the desktop icon;
it even gives no error message.
The QT Designer exe "designer.exe" is placed in "apps\qt5\bin". When I
start the designer.exe here, some DLLs are missing: libpng16.dll,
zlib.dll and more. They are located in "bin".
But after copying the missing dlls to "apps\qt5\bin" a new issue occurs:
"This application failed to start because no Qt platform plugin could be
initialized."
I am also not able to open Qt designer via the qgis-ltr-designer.bat.
I'm running QGIS 3.40.14 on Windows 11.
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