Hi,

I have been deploying Adobe Reader 9.4.6 patch for 4000 + machines having 9.4.5. Successfully installed for 3500+ machines. However 200+ machines are \failing with Error :1646.
I have run the cmd line with verbose log as below (last part of log files). Please help to get the solution.
___________________
MSI (s) (AC:1C) [15:17:08:734]: SequencePatches returns success.
MSI (s) (AC:1C) [15:17:08:734]: Final Patch Application Order:
MSI (s) (AC:1C) [15:17:08:734]: Other Patches:
MSI (s) (AC:1C) [15:17:08:734]: Unknown\Absent: {AC76BA86-7AD7-0000-2550-7A8C40000946} - C:\WINDOWS\system32\CCM\Cache\NS200271.2.System\AdbeRdrUpd946_all_incr.msp
MSI (s) (AC:1C) [15:17:08:734]: Unknown\Absent: {AC76BA86-7AD7-0000-2550-7A8C40000943} -
MSI (s) (AC:1C) [15:17:08:734]: Unknown\Absent: {AC76BA86-7AD7-0000-2550-7A8C40000945} -
MSI (s) (AC:1C) [15:17:08:734]: Machine policy value 'DisablePatch' is 0
MSI (s) (AC:1C) [15:17:08:734]: Machine policy value 'AllowLockdownPatch' is 0
MSI (s) (AC:1C) [15:17:08:734]: Machine policy value 'DisableLUAPatching' is 0
MSI (s) (AC:1C) [15:17:08:734]: Disallowing uninstallation of patch {AC76BA86-7AD7-0000-2550-7A8C40000943} because the patch is marked as not uninstallable
MSI (s) (AC:1C) [15:17:08:734]: Product: Adobe Reader 9.4.1 - Update 'Adobe Reader 9.4.3 - CPSID_83708' could not be removed. Error code 1646. Additional information is available in the log file c:\readerfail.log.
MSI (s) (AC:1C) [15:17:08:734]: Product: Adobe Reader 9.4.1 - Update '{AC76BA86-7AD7-0000-2550-7A8C40000946}' could not be installed. Error code 1646. Additional information is available in the log file c:\readerfail.log.
MSI (s) (AC:1C) [15:17:08:734]: Product: Adobe Reader 9.4.1 - Update 'Adobe Reader 9.4.5 - CPSID_83708' could not be removed. Error code 1646. Additional information is available in the log file c:\readerfail.log.
MSI (s) (AC:1C) [15:17:08:734]: Note: 1: 1708
MSI (s) (AC:1C) [15:17:08:734]: Note: 1: 2729
MSI (s) (AC:1C) [15:17:08:734]: Note: 1: 2729
MSI (s) (AC:1C) [15:17:08:734]: Product: Adobe Reader 9.4.1 -- Installation failed.
MSI (s) (AC:1C) [15:17:08:734]: Attempting to delete file C:\WINDOWS\Installer\1915f97.msp
MSI (s) (AC:1C) [15:17:08:734]: MainEngineThread is returning 1646
Uninstallation of the patch package is not supported.
C:\WINDOWS\system32\CCM\Cache\NS200185.1.System\AcroRead.msi
MSI (c) (7C:D4) [15:17:08:843]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (c) (7C:D4) [15:17:08:843]: MainEngineThread is returning 1646
=== Verbose logging stopped: 10/25/2011 15:17:08 ===
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http://msdn.microsoft.com/en-us/library/windows/desktop/aa368542(v=vs.85).aspx
ERROR_PATCH_REMOVAL_UNSUPPORTED 1646 The patch package is not a removable patch package. Available beginning with Windows Installer version 3.0.

There could be a number of reasons for this such as an Office / IE (or a web browser) / Adobe product / etc is running or maybe a reboot is required.Or as it suggests, in some way the install you are attempting to patch is not patchable with the patch you are using. I would get one of the offending machines and attempt the install and get the visible error message. You may need uninstall and reinstall.
Answered 10/25/2011 by: jmaclaurin
Third Degree Blue Belt

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Thanks for quick reply.
Will check by uninstalling and reinstalling apps. If you find any other solution please let me know.
I have checked the user machines ADD/Remove Program, Reader Versions (weird) displayed as screenshot
http://packagesoln.blogspot.com/
or http://lh6.ggpht.com/-60tkrwzmj2g/TqcVQ6on7iI/AAAAAAAACec/VPB3RNKmlWE/s1600-h/image%25255B4%25255D.png

Answered 10/25/2011 by: OMUS
Senior Yellow Belt

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Sorted for me, thanks.
Answered 10/26/2011 by: trianon
Yellow Belt

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