Acrobat DC on the Mac is a 64bit application. This is good for the performance. But this also requires that all third-party plug-ins (e.g. Enfocus PitStop, Callas pdfToolbox, Quite, etc.) are in 64bit. You cannot just move the existing plug-ins from an older Acrobat installation to Acrobat DC. You must get an update of all of your third-party plug-ins. For the most important plug-ins you can find additional information on a german info page from Impressed.
Windows users don’t have to worry about this for now since Adobe did not manage to move the Windows version to 64bit yet. This will happen later (and then you will have the plug-in problem also on Windows…).
Adobe has removed the download links for the Acrobat 9 updates from their web pages. Possibly because Acrobat 9 is officially no longer supported.
But there are many users stilling working successfully with Acrobat 9.
Sometimes a new installation is required which means installing Acrobat 9.0.0 and all incremental updates. Unfortunately the menu Help > Check for Updates… does not always work proberly.
Fortunately one can still download the updates from the Adobe FTP server:
- Macintosh: ftp://ftp.adobe.com/pub/adobe/acrobat/mac/9.x/
- Windows: ftp://ftp.adobe.com/pub/adobe/acrobat/win/9.x/