[wix-users] WiX Upgrade without uninstallation of existing version

[Rambabu Nethi]

Hi Venkat,

I don't think you can achieve this with the Major upgrade. If there is a
data loss, I am assuming that they are the configuration files. So Before
the upgrade, Backup those files and after the upgrade restore them.

For Fresh installations, any ways the files will be installed.

Best Regards,
Ram

On Wed, Nov 15, 2017 at 7:45 AM, Ven H via wix-users <
wix-users at lists.wixtoolset.org> wrote:

> The MajorUpgrade element in WiX seems to be uninstalling the existing
> version. But I have a requirement wherein I have to upgrade from 1.0.0 to
> 2.0.0 without uninstalling 1.0.0. But this doesn't mean, it will have both
> 1.0.0 and 2.0.0 showing in the Add/Remove Programs. My 1.0.0 version has a
> file, a registry entry, a custom windows service and so on. My 2.0.0
> essentially, will modify an existing file and add a new file. In our case,
> it is possible to make only changes like these and still increment the
> major version. But for this, I don't want to uninstall and reinstall the
> services and so on. But if it's a fresh install, all the components will
> have to be installed. For example, if a customer has 7.9.0 version
> installed and wants to upgrade to 8.0.0 (This technically might be a major
> upgrade because major version is updated or minor upgrade because there may
> be only incremental changes going from 7.9.0 to 8.0.0?), uninstalling 7.9.0
> completely may lead to issues like loss of data and so on. Is there a way
> to achieve this? If so, can anyone please provide some steps / examples or
> provide some links showing this? Note: I am *not* talking about Patch. I am
> able to get a patch working. But I am also confused between Minor upgrade
> and Small update.
>
> FireGiant's Tutorial
> <https://www.firegiant.com/wix/tutorial/upgrades-and-
> modularization/checking-for-oldies/>
> talks
> about using <Upgrade> element whereas there are many other articles which
> talk about using <MajorUpgrade> element.
> Regards,
> Venkatesh
>
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