Forcing Installshield to uninstall before an install

upgrade installshield uninstallation installscript
MHG picture MHG · Mar 13, 2009 · Viewed 10.4k times · Source

I have an InstallShield 12 installscript. I want to uninstall the old version before installing the new version. I will keep the name of the package unchanged. How can I do this?

Answer

Alonso picture Alonso · Jan 21, 2010

Assuming this is not an MSI project and youve kept the same Project GUID, you could simply call ComponentUninstall() in the OnMaintUIBefore function. If the Project GUID is not the same you can look at the uninstall string in the registry under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{PROJECT_GUID} and then do a LaunchApp with that.

Hope it helps.

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