You can use the same page to download internal statements of entry.
External candidates are not included using the Download statement of entry (by candidate) option. This is because this option can only be used for currently enrolled students, not for students who are no longer enrolled (previous candidates) or never enrolled (external candidates).
If you do want to use this method, you can create a custom group for your external candidates. Be sure to select All Students when creating your custom group, as this will pull through unenrolled students.
Once you have created this group of external candidates, You will then be able to select the custom group in the Download statement of entry (by candidate) option.