I know this post is a few months old, but for those that still need the info:
Updating Adobe Acrobat Professional from 9.0.0 to 9.1.2
1. Download the 2 patches, AcroProStdUpd910_T1T2_incr.msp (this updates to 9.1.0) and AcrobatUpd912_all_incr.msp (this updates to 9.1.2) and place them in the same folder.
If you are already at 9.1, you don't need the first patch.
2. Copy the AcroPro.msi file from C:\Program Files\Adobe\Acrobat 9.0\Setup Files\guid (I didn't feel like typing out the whole string) to the folder with the patches. This is where the setup placed this file for my installation of CS4; your location could be in a different spot.
3. Create your script with the following 2 lines:
msiexec /p "%installdir%\AcroProStdUpd910_T1T2_incr.msp" /qn /norestart REINSTALL=ALL REINSTALLMODE=omus
msiexec /p "%installdir%\AcrobatUpd912_all_incr.msp" /qn /norestart REINSTALL=ALL REINSTALLMODE=omus
Substitute your path to the folder with the patch files for %installdir% above.
Obviously, this procedure is for updating Windows only. This was only tested on Windows XPSP3 with Adobe Acrobat Professional 9.0.0 as installed as part of CS4 Master Collection.
