Another version of this product is already installed
I tried to create an upgrade path so that I'm not forced to uninstall my application with each new revision. This feature is not working for me and its not clear what are the requirements to get simple upgrades working. Its perfectly ok for a full uninstall and reinstall - I just don't want to have to manually reinstall from the control panel each time.
This error usually occurs if you are attempting to run a minor upgrade but the REINSTALL and REINSTALLMODE properties aren't set. This should get set when using an exe - if you were running just an msi you would need to run msiexec.exe /i \product.msi REINSTALLMODE=vomus REINSTALL=ALL
