This sounds more like an Windows Installer question than a NantContrib question.

You have to write your MSI so that it can be upgraded by subsequent
versions. See the Microsoft Windows Installer SDK for details on how
to do this :

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/msi/setup/patching_and_upgrades.asp


On 03/08/05, Dean Hiller <[EMAIL PROTECTED]> wrote:
>  
>  
>  
> 
> When I try to run a newer version of the installer created by msi task and I
> already have a previous version of the product installed, I get the
> following error…. 
> 
>   
> 
> Another version of this product is already installed 
> 
> Installation of this version cannot continue.  To 
> 
> Configure or remove the existing version of this product, 
> 
> Use Add/Remove Programs on the Control Panel. 
> 
>   
> 
> Any way to change this so it will do the upgrade?  Also, any way to stop the
> windows services before the upgrade starts? 
> 
> Thanks, 
> 
> dean 
> 
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