<p>At work we use <a href="http://en.wikipedia.org/wiki/WiX" rel="noreferrer">WiX</a> for building installation packages. We want that installation of product X would result in uninstall of the previous version of that product on that machine.</p>

<p>I've read on several places on the Internet about a major upgrade but couldn't get it to work.
Can anyone please specify the exact steps that I need to take to add uninstall previous version feature to WiX?</p>

Finally I found a solution - I'm posting it here for other people who might have the same problem (all 5 of you):
Change the product ID to *
Under product add The following:
```
```
<Property Id="PREVIOUSVERSIONSINSTALLED" Secure="yes" />
<Upgrade Id="YOUR_GUID">  
   <UpgradeVersion
      Minimum="1.0.0.0" Maximum="99.0.0.0"
      Property="PREVIOUSVERSIONSINSTALLED"
      IncludeMinimum="yes" IncludeMaximum="no" />
</Upgrade>
```
```
Under InstallExecuteSequence add:
```
```
<RemoveExistingProducts Before="InstallInitialize" />
```
```
From now on whenever I install the product it removed previous installed versions.
Note:
replace upgrade Id with your own GUID