Hi,

Here are some steps I would suggest:

1. In Qt48x, demo_shared.lib is not automatically generated during the Qt building process. I suggest that you use either QtCreator or VS2013 Qt Add-in to build it. However, as Zhi has already mentioned, Qt48x has issues with puglin loading/unloading. So I would suggest that you avoid using Qt48x until we solve this problem.

2. Please go to your Qt472 folder to check if you have demo_shared.lib. If so, then it means your system path hasn't changed to Qt472 yet and it's still searching for it in the wrong place. You can also check by typing 'qmake --version' on command prompt to see if it's using Qt472 libraries or not. If it's not using Qt472 libraries and you can find demo_shared.lib in your Qt472 folder, change the environment variables accordingly. If it's using Qt472 libraires but you don't have demo_shared.lib, then you will have to either use QtCreator or VS2010 to build it. 

Hole it helps.