Once downloaded, the ISO image (ISO) must be burnt on a CD as "IMAGE" and not as "DATA". Pick your favourite CD burner to do the job. If you are using Windows OS, you may want to use a program such as Nero or Imageburn. If you are using Linux, programs such as K3B, Brasero or GnomeBaker will do the job well. PLEASE ENSURE that ISO IMAGE is burnt on a CD as "IMAGE" and NOT as "DATA" or "VIDEO/AUDIO FILES". If you are not sure, please check the user manual/help files of the program you wish to use.