How to implement WiX installer upgrade?

Question

At work we use WiX for building installation packages. We want that installation of product X would result in uninstall of the previous version of that product on that machi

Answer 1

I'm using the latest version of WiX (3.0) and couldn't get the above working. But this did work:

Note that PUT-GUID-HERE should be the same as the GUID that you have defined in the UpgradeCode property of the Product.