Unable to open Acrobat 9 Pro on Mac High Sierra 10.13.6

Hello Davidd,

Acrobat Pro 9 is old and out of support product and it is not compatible with Mac High Sierra 10.13.6. The last Mac os version on which Acrobat 9 was tested was Mac OS X v. 10.4.11 or 10.5.

For detailed information about the technical specifications, please refer to the article Older versions of Acrobat (XI, X, 9) system requirements

For support details of Acrobat products, please refer to End of support | Reader 9 and Acrobat 9 (and earlier)

You may refer and try the suggestions from the following Adobe help article and check. The suggestions may or may not work due to the compatibility issue https://helpx.adobe.com/archive/acrobat/acrobat-9-troubleshooting.pdf

Feel free to update this discussion for any further assistance.

Thanks,

Anand Sri.