InstallAware

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.

File Attached:

Error.JPG

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?

Thanks,
...Matt