I have gone ahead and done the XML export of all the data, 

I’m trying to open the attachments but every time I click on the link it says.

“

This XML file does not appear to have any style information associated with it. The document tree is shown below.

<Error>

<Code>MissingKey</Code>

<Message>Missing Key-Pair-Id query parameter or cookie value</Message>

</Error>

 “ 

I have created a API key and tried using that but still getting the same issue any insights on how I can be able to open attachments from the XML data. 

Thanks, in advanced.