Cannot open .pdfs. Updates downloaded. Please help

"There was an error opening this document. The file is damaged and could not be repaired."
This is the error message I have been getting for the last three weeks or so. Cannot open .pdfs on MacBook Pro. No changes have been made to computer. Please offer suggestions. Adobe Reader updates have been downloaded. Please help! Thanks.

If Reader and Preview can't open them, they are most likely damaged.

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Cannot open .pdfs. Updates downloaded. Please help

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