Adobe Reader 9 ends compatibility with Adobe Reader Extensions 5 and 6 which permit Adobe Reader client software to save changes to filled-in forms in PDFs. Adobe Reader Extensions 6.1 and newer are still usable.
Installing updates typically takes just a few minutes. You can also update Acrobat automatically. Acrobat is available in Continuous and Classic product tracks. You can choose the appropriate track based on your deployment needs. Select a link for details