It does not need to install. QSerialDevice (as well as other libraries) - it's just a class library.
To use these classes, you can not compile the library - and connect directly via *. pri, what is the easiest way.
See examples /test/guiapp
PS
1. There may be a problem in 64 bit Windows, when you open the port, if Qt4 is compiled for 64 bit.
But if you use 32 bitQt4 to 64 bit Windows - then no problem.
2. Current stable version here
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