Qt VS addin 1.2.4 & VS2013 express
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AFAIK plug-ins are not supported by msvs express versions. This is a limitation of msvc express.
For better support you might want to use Qt creator, which can use also the msvc compiler. There is no need to use the addin then.
Apparently, with the new download the remark concerning is isse is no longer present. -
If you really need/like Visual Studio, see if you qualify to use the Community Edition, that is a Visual Studio Professional so it should support plugins (note: i didn't tested it with Qt add-in, but it should work just like the paid editions).