Qt programme #3

Hello

In the ‘How to build for Windows’ section, there is a step to build ScienceMode.pro after downloading a programme called Qt, but I had difficulty starting from the part of setting up the Qt programme. Is there any option to select when downloading the Qt programme and if it is mingw530_32, does it only support 32bit?
Is there a manual to set the additional argument? If there is, please give it to me.