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I am revising a document for an author. They created the document in PDF pro, and have given permision for me to comment on the document. However, whever I save the document as a new one and then try to reopen the document I saved, then I get this error. I am using Adobe Acrobate Reader DC.
"This document enabled extended features in Adobe Acrobat Reader. The document has been changed since it was created and use of extended features is no longer available. Please contact the author for the original version of this document."
Any help would be appreciated.
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As the message saids, the document has been changed since the Reader Extension where applied to it. This may be caused accidently by an compressing error through an e-mail application or so. There's nothing you can do about this in Acrobat Reader. Ask the author to send you the form again but packed in a ZIP file.
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Do a double check the file on another computer. If the error message also appears there the root of all evil propably lays on the senders site. Since the authors generally using Acrobat Pro they do not recognise problems with the Reader Extension in PDFs as those are only checked by Acrobat Reader. Ask him to apply the Reader Extensions again and resend the file to you.