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 read the WiX documentation, downloaded examples, but I still had plenty of problems with upgrades. Minor upgrades don't execute uninstall of the previous products despite of possibility to specify those uninstall. I spent more that a day for investigations and found that WiX 3.5 intoduced a new tag for upgrades. Here is the usage:

But the main reason of problems was that documentation says to use the "REINSTALL=ALL REINSTALLMODE=vomus" parameters for minor and small upgrades, but it doesn't say that those parameters are FORBIDDEN for major upgrades - they simply stop working. So you shouldn't use them with major upgrades.