Simply execute the installer and follow the instructions. TreeSize Free can be uninstalled through the Windows Control Panel. Supported operating systems are Windows XP, Windows 2003 Server, Windows Vista, Windows Server 2008 (R2) and Windows 7, including the 64Bit editions. Besides a normal installer a ZIP file with TreeSize Free is available, which saves its settings locally and can e.g. be used on a portable USB Stick.