After install qt-opensource-windows-x86-5.12.12.exe you have to copy the following files to the application directory:
- libgcc_s_dw2-1.dll
- libstdc++-6.dll
- libwinpthread-1.dll
- Qt5Core.dll
- Qt5Gui.dll
- Qt5Network.dll
- Qt5PrintSupport.dll
- Qt5Widgets.dll
With the default installation, the files are located in the directory: C:\Qt\Qt5.12.12\5.12.12\mingw73_32\bin\
And to subfolders:
* pluginsplatforms:
- qminimal.dll
- qwindows.dll
z C:\Qt\Qt5.12.12\5.12.12\mingw73_32\plugins\platforms\
* pluginsstyles::
- qwindowsvistastyle.dll
z C:\Qt\Qt5.12.12\5.12.12\mingw73_32\plugins\styles\