Have you read the MSI SDK about major upgrades?  It sounds like you're 
not using the UpgradeCode to its full potential.

mscheuner wrote:
> I found the problem: in order to get the "double-click the MSI to install"
> metaphor working, we're always creating a new ProductID with each build -
> the minor updates (leaving the ProductID intact and just updating the
> Version attribute) don't work, since double-clicking on such a MSI will only
> result in a dialog saying "there's already another version of this product
> installed; please uninstall first". (or is there a trick how to get this to
> work properly?? Even the Tramontana WiX tutorial says you have to use
> unwieldy command-line parameters for MSIEXEC to get it to work
> properly....unbelievable!).
>
> Thus, since the install location is stored PER PRODUCT, the new MSI won't
> find any pre-installed product and thus won't find the previous product's
> installation location (at least that's what I'm guessing, from the logs).
> Also, if you uninstall the old product version first, and then run the minor
> upgrade MSI, obviously the old product and thus its install location with it
> are gone - so that doesn't work either.....
>
> Any more ideas?? Doesn't seem like all that much to ask, no? Product A v1.00
> should store its install location, and a minor upgrade to v1.01 should work
> by double-clicking on a MSI (no crazy command line) and should just nicely
> upgrade in the folder chosen by the user when installing 1.00........ heck,
> even my rudimentary script-based install can do that! And Windows Installer
> can't???  Sheesh.......
>
> Thanks!
> Marc
>   

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