When trying to install an older version of my product, InstallAware displays a non-descript error message 'Error'.
This is reproducable using a blank project and changing the product and revision codes (but not the upgrade code) and installing version 1.1 then attempting to install 1.0.
Also, if I change only the revision code between 1.1 and 1.2 versions, it uninstalls 1.2 before installing 1.1. Is it not supposed to say that a later version is already installed?
