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I've been using Acrobat XI Pro for some time now; however, recently I've been unable to combine PDFs. I get the following:
To the best of my knowledge, the only think I changed was updating to Windows 11.
Any help on how to resolve this issue would be appreciated.
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You can combine files, but not as a Portfolio.
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Flash Player was discontinued a few years ago and Acrobat XI will never be updated since it's discontinued too.