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I'm following the instructions for Preventing the Current Installation from Overwriting a Future Major Version of the Same Product, as described in the manual, and it works except the ISPreventDowngrade always displays a blank error message. At the ...

I'm using a Basic MSI project, and I'd like to keep it that way if possible. I've looked at the other threads on this issue, and none of them seem to address my issue. I'm using a SetProperty custom action, which runs just before CostInitialize. T...