A strange behaviour I can't explain:

If I run 'Adobe Reader 7.0.msi' package from explorer by double-clicking, it uninstalls Acrobat Reader 6.0 from my vomputer.

But when I publish the same .msi package via Group Policy and run installation from 'Add/Remove Programs' in Control Panel, previous version (Acrobat Reader 6.0) will not be uninstalled.

I am not very experienced in .msi packaging, maybe someone could explain this behaviour (and how can I force the uninstall of old Reader). I have tried several modifications in the .msi, but with no success.

Thanks in advance,
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You can check the registry settings for the previous installed Adobe version at:


Check find adobe version and check Uninstallstring value.

You could copy this value (starts with msiexec /x ). Save as a uninstall.bat, run it before the installation. You can do it by adding custom actions.
Answered 01/21/2005 by: Priapus
Orange Belt

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You can go to the upgrade table and add your old msi so you can uninstall
Answered 05/12/2005 by: ClaesG
Yellow Belt

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Does it install Reader 7.0 when you push it via GPO? From my experience, it is better to push a cmdline to uninstall Reader 6.0 before pushing the 7.0 msi because the original msi prompts for a reboot after 6.0 is removed.
Answered 05/18/2005 by: hpizzel
Senior Yellow Belt

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I guess this is a bit late now, but where were the shortcuts installed for versions 6 and 7 (the users' profile or the AllUsers profile)?
Answered 05/18/2005 by: WiseUser
Fourth Degree Brown Belt

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Answer this question or Comment on this question for clarity