Is it possible to upgrade only by using the old MSI and my new MST? here's the situation.
The software is already installed using MSI and MST.
However, I need to add 1 file and so I edited the MST and add the file but we don't want to reinstall the installed software, they only want an upgrade to copy the needed file.
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Yes possible by using Upgrade table, but only if you change ProductCode (ProductCode chnaging isn't good practice).

In your case better to create MSP file as difference between first MSI+MST and the latest MST+MST.

Anyway the best solution is uninstallaing via centralized solution and installaing new version agagin.
Answered 06/01/2011 by: itolutions
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You can try one of the below. I suppose this should work for you.

msiexec /fv <msipath>.msi ADDSOURCE=ALL

msiexec /i <msipath>.msi REINSTALL=ALL REINSTALLMODE=vomus
Answered 06/01/2011 by: murali.bhat
Purple Belt

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