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: Acrobat 9 has not received security patches for over a decade. Since PDF files are a common vector for malware, using an outdated reader poses a significant security risk to your system.
If you must use Acrobat 9, there are limited steps to improve its chances of functioning, though success is not guaranteed: is adobe acrobat 9 compatible with windows 11
If you're currently using Adobe Acrobat 9 and need to upgrade to a version compatible with Windows 11, here are some options: : Acrobat 9 has not received security patches