Only Reason 7, the latest version of the application, is not compatible with Windows XP. Check the list below in order to see the Reason compatibility:
Reason 3 - Windows XP, Windows 2000 or later;
Reason 4 - Windows XP SP2, Windows Vista or Windows 7;
Reason 5 - Windows XP SP3, Windows Vista or Windows 7;
Reason 6 - Windows XP SP3, Windows Vista or Windows 7;
Reason 7 - Windows 7 or later.