I have Adobe Acrobat 9 Pro,i want upgrade to X Pro . But i can't choose Acrobat 9 to enter the serial number of Acrobat 9.
What do i wrong?
The Acobat 9 is parts of CS 4. X is "stand alone".
Sorry for the delayed response and inconvenience caused. As per the description above, you are not able to upgrade the Acrobat 9 to Acrobat 10, is that correct?
Acrobat 9 and Acrobat 10 are already declared as an end of support and end of life product, and they are also not available for sale. For detailed information, please refer to Adobe article End of support for Acrobat X and Reader X
The recommendation will be placing a new order for the latest version of Acrobat Pro DC, you can refer to the following Adobe article for plan and pricing Plans and pricing | Adobe Acrobat DC
You can also contact the Adobe support team for detailed information about plan and pricing and to place a new order Contact Customer Care
Feel free to update this discussion for any further assistance.