There are several reasons why a download option may not be available:
The programme has only just been published
If a programme has only recently become available, there may be delay with processing the various download files. This is most likely if the programme was broadcast live or close to live (recently recorded) and the files could not be prepared in advance. Try checking again later.
Sometimes we cannot acquire the rights to allow a programme to be downloaded. Sports programmes and films are most likely to be streaming only.
Technical problems can cause a file not to be available.
If you think you've spotted a programme fault on BBC iPlayer check our Latest Programme Issues FAQ. If it's not listed then please let us know by clicking on the 'Contact Us' link at the bottom of this FAQ and then selecting Report a Fault as the contact type.