Donald,
I assume you're getting this message:
"Slow Down! You are trying to download files too quickly. You must wait n seconds before you may download another file."
This is occurring when you're attempting to download .pdf files, such as manuals?
This is implemented purposely to prevent a potential 'denial of service' attack by programmatically sending GET requests for PDF pages.
I tested it and didn't have an issue after waiting through download time.
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