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In Qt, when you attempt to open a resource file (indicated by the :/ prefix), you cannot open it for writing (QIODevice::ReadWrite). Resource files are typically compiled into your application’s binary and are read-only by default. Therefore, attempting to open a resource file for writing will fail, resulting in the error you encountered.

To set equal portions in Layout :

• Create a QHBoxLayout container.
• Add your two widgets (let’s call them widget1 and widget2) to this layout.- Set the stretch factor for both widgets to 1 (equal parts).
• The widgets will automatically share the available horizontal space equally.

How to deploy QT your project on windows

• open Qt 6.7.0 (MinGW 11.2.0 64-bit) application
• cd then full project release file path
• Run windeployqt.exe --quick . command .
• DONE .

YOUTUBE for full setup : How to Create Executable & Installer (.Exe) File for QT Project (youtube.com)