Installation

First of all, qaac is a console application for MS Windows, and depends on Apple Application Support. Apple Application Support is not shipped as an independent package, but included in Apple products such as iTunes or QuickTime. You need a version at least included in iTunes 10.5 or later. Usually, the latest one is recommended.

To install qaac, just extract the archive qaac_x.xx.zip. There included x86 folder that contains 32bit binaries and x64 folder that contains 64bit binaries. If you are running 32bit OS, you can use only 32bit binaries. Otherwise, you can use both of 32bit and 64bit binaries. Depending on your OS, copy binaries (exe and DLL) to where you like.

If you want qaac to directly read FLAC, WavPack, TAK, or other formats supported via libsndfile, you have to additionally obtain the following libraries.

FLAC

The latest libFLAC win32 binary doesn't seem like officially provided, but you can get them from www.rarewares.org. Download libFLAC v.1.3.1 for win32 or win64. Copy libFLAC_dynamic.dll in the archive to the same directory as qaac.
At least libFLAC 1.2.1 to 1.3.1 is compatible with qaac. Other than libFLAC_dynamic.dll, qaac recognizes libFLAC.dll and LibFLAC-8.dll.

WavPack

Download wavpackdll.zip from http://www.wavpack.com/downloads.html. Install wavpackdll.dll in the archive into the same directory as qaac (You need DLL under x64 folder for qaac64.exe).

TAK

Download tak-x.x.x.zip from http://www.thbeck.de/Tak/Tak.html. Install tak_deco_lib.dll in the archive into the same directory with qaac.
Note that this is for 32bit only.

libsndfile

Download libsndfile installer (w32 and/or w64, depending on your needs) from http://www.mega-nerd.com/libsndfile/. Run installer, and copy libsndfile-1.dll from Program Files/Mega-Nerd/libsndfile.