Qt is split into modules, so if you don't use Webkit you don't include that module, if you don't use networking you don't include that, if you only do a CLI app you don't include the GUI module.
I just checked VLC now and the Windows download has 38Mb, Qupzilla installer has 78Mb(this is a browser so it bundles webkit and probably some js enbine),
I am familiar with this complaint , at a previous workpolace we switched to Adobe AIR because of the installer size (the boss felt better if the customers installed AIR from Adobe and then our 2 Mb installer). At that time Qt did not had a built in way to create installers, signing them, and autoupdate applications,(not sure it has now) Adobe AIR had such mechanism so this also was a factor on switching to this toolkit then.
So if you think Qt is big what would you use instead?
You misread my original comment, and the follow up.
I thought you were being smart with 50 megabits in your earlier comment or I would have caught that misunderstanding earlier.
You did not mention what cross platform tool is smaller and works with proprietary software.1