It cannot be used in Windows XP/Vista and Mac OS X 10.5/10.6/10.7.
rekordbox 4.0.0 supports the following operating environments.
Mac OS X: 10.10, 10.9, and 10.8
Intel® processor, Core™ i3, i5, and i7
At least 4 GB of RAM
Windows: Windows 8.1, 8, and 7
32-bit version
Intel® processor, Core™ i3, i5, and i7
At least 4 GB of RAM
64-bit version
Intel® processor, Core™ i3, i5, and i7
At least 4 GB of RAM