Please note don't use quotes (') while entering text.

Enter the site address to download
go to 'Set Options'
tab to 'Scan Rules'
click on 'Include Link(s)..'
in 'Criterion:' select 'File names with extension:'
in 'String:' enter '*'
click on 'Add'
#next
tab to 'Spider'
in 'Spider:' select 'no robots.txt rules'
click on 'OK'

that's done.