I installed Acrobat DC on a new laptop. It works very well, BUT the sticky notes I add to a PDF do NOT appear on my other compuet's Acrcobat Pro 9. How can I fix this?
As per the issue description mentioned above, you have added sticky notes on a pdf in Acrobat DC but when the same pdf is opened in Acrobat 9 on another machine, sticky notes don't appear, is that correct?
Acrobat 9 is quite an old product and not compatible with most of the newer operating system. Could you let us know the operating system running on the machine which has Acrobat 9 installed?
Also, let us know Acrobat 9 pro version installed on the machine? You may refer to the steps given in this link on how to check the version in Acrobat: Identify the product and its version for Acrobat and Reader DC
Also, would it be possible to share the pdf file you are working with? To share the file here in the forums, refer to the steps given in this link: How to share a file using Adobe Document Cloud
You may also share the link for the pdf via private message - How Do I Send Private Message
Let us know if you need any help.