No, Adobe Acrobat 9 is not compatible with Windows 11.
: Adobe does not list Acrobat 9 as a compatible application for Windows 11. Supported versions start from Acrobat 2017 , and the current Acrobat DC Performance Issues : Users on Adobe Support Community
Acrobat Standard/Pro (2020 or Subscription): Modern versions that fully support Windows 11. is adobe acrobat 9 compatible with windows 11
: Because Acrobat 9 no longer receives security patches, using it on a connected Windows 11 machine leaves your system vulnerable to PDF-based exploits. Potential Workarounds (Unstable) If you must try to run Acrobat 9, users often suggest: Compatibility Mode
Given the incompatibility, you might consider these more modern options: No, Adobe Acrobat 9 is not compatible with Windows 11
The short answer is: No. Adobe Acrobat 9 is not officially compatible with Windows 11. While you might technically force the installation, doing so creates significant security risks and functional instability. Adobe and Microsoft recommend using a modern version of Acrobat (such as Acrobat Pro DC or Acrobat 2020) on Windows 11.
Known Issues: Windows 11 security features, such as "Smart App Control," may block Acrobat 9 because its drivers are not properly signed for the new OS. How to Run Acrobat 9 on Windows 11 (Unofficial Guide) : Because Acrobat 9 no longer receives security
Adobe explicitly lists only Acrobat DC (Pro and Standard) and versions 2017 and 2020 as officially supported on Windows 11.