Sorry.. the solution was to execute the msi like this:

msiexec.exe /I product.msi REINSTALL=All REINSTALLMODE=vomus

So I am not stuck anymore.

Regards,
Daniel



Daniel Marjamäki wrote:
> 
> I am having trouble with upgrades.
> Upon installation I want to completely uninstall any old versions.
> 
> I have seen so many answers about this in various places. But nothing
> works.
> 
> I use the same UpgradeCode in both old and new versions.
> I use the same Product Id in both old and new versions.
> 
> I use wix 3.0.5419.0
> 
> Here is my WIX code:
> 
>     <Upgrade Id='$(var.ProductUpgradeCode)'>
>       <UpgradeVersion OnlyDetect='no' Property='PREVIOUSFOUND'
>        Minimum='1.0.0' IncludeMinimum='yes'
>        Maximum='$(var.ProductVersion)' IncludeMaximum='no' />
>     </Upgrade>
> 
>     <InstallExecuteSequence>
>         <RemoveExistingProducts After="InstallInitialize" />
>     </InstallExecuteSequence>
> 
> When I compile that I get no error messages.
> When I execute the MSI I get an error message that another version is
> already installed and I need to uninstall that manually.
> 
> What is the PREVIOUSFOUND good for? I don't have it anywhere else in my
> WIX file. None of the answers I have seen so far have explained this.
> 
> I wonder how the RemoveExistingProducts knows which entry to look at in
> the upgrade table. If I have two UpgradeVersion elements in the upgrade
> table (to also prevent downgrade) then a newer version of my program might
> be matched in the upgrade table.
> 
> 

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