You could try creating a new account using the instructions here http://kb2.adobe.com/cps/404/kb404927.html. Update Acrobat from the new account and see if the patching works now.

Also, could you please provide the log files for the failing patch. To obtain the log , follow the following steps:

1.  Clear the contents of /user/library/adobe/logs folder

2. Open Console, located in the  Applications- > Utilities folder.

3. Update Acrobat to generate the error message.

4. Check the console for error messages and save console log file

5. Go to /user/library/adobe/logs and share the patch log file

This is the same issue I'm having.  I can't even uninstall 9.5 and start from scratch.  I'm running OS X 10.4.7  Can you help?

I am chiming in too.  I started from scratch installing OSX.8,  Installed Acrobat 9.0.0 Pro along with CS4.  Rebooted several times for unrelated reasons.  In Photoshop I updated all of CS4.  Each of the other applications in CS4 updated.  Acrobat did not.  So I manually chose the update file off of Adobe's downloads.

Used the AcroProUpd951_all.dmg to update.  The updater opened a window instructing me to "Please choose the copy of Adobe Acrobat Pro to update."  I go into the default "Application>Adobe Acrobat 9 Pro" folder, but it will not allow me to choose "Adobe Acrobat Pro.app". The app is greyed out.

The frustrating thing is that in the help menu there is no auto update.   So I am forced to do it manually.  I am having problems finding the various .dmg files to update  9.1 9.2 on the adobe site.  Anyone have a direct link?

To make it more agrivating, once I got to 9.3.2, the "Check for Updates" appeared in the help menu.  But as I am using OSX.8, its new security feature would not allow the update to run since it was from an unidentified developer.  Oh the misery of using outdated software with a up-to-date OS.

When I went to the folder Applications>Utilities>Adobe Utilities>Adove Updater5" and opened up the application manually, there were no new updates.

I also tried the folder "Applications>Utilities>Adobe Utilities>Adove Updater6" and this version of the updater said there were no new updates.

Well, it seems to have all worked out.  I downloaded 1.21GB consisting of 20 update files, ran them in sequential order.  So from 9.0.0 to 9.5.1 its finally done.

YEA