I wrote an install program with Wix and it worked fine to install my program. Now I need to update it, so I bumped up the version number but when I go to install the new program over the old one it complains that an older version is already installed and tells me to uninstall it first.
How do I get it to update or automatically uninstall it before reinstalling?
I checked through all the posts mentioned above and still spent ages trying to get this to work.
The hint on the official HOWTO for upgrades in Step 3 helped a lot: You need a new Product/@Id to disable the message "Another version of this product is already installed".
I used this upgrade section (child of Product):
<Upgrade Id="$(var.UpgradeCode)">
<UpgradeVersion Minimum="1.0.0"
IncludeMinimum="yes"
OnlyDetect="no"
Maximum="$(var.Version)"
IncludeMaximum="no"
Property="PREVIOUSFOUND" />
</Upgrade>
Note that OnlyDetect is set to "no". This triggers the removal of the old version, if you have the following section (child of Product):
<InstallExecuteSequence>
<RemoveExistingProducts After="InstallInitialize"/>
</InstallExecuteSequence>
Also note that apparently, only the first three components of the version number are used to check for upgrades...
You need to use the upgrade table:
<Upgrade Id='15E2DAFB-35C5-4043-974B-0E342C25D76A'>
<UpgradeVersion Property='OLDVERSIONFOUND' IncludeMinimum='no' Minimum='0.0.0.0' />
</Upgrade>
You need also add an action:
<InstallExecuteSequence>
<LaunchConditions After='AppSearch' />
<RemoveExistingProducts After='InstallValidate' />
</InstallExecuteSequence>