[wix-users] How to downgrade a file to an older version in a patch?

[Patterson, Brent]

The issue is that the patches are uninstallable, so we can't ask them to do that.

I tried the major update approach (changed Product ID value to a new GUID, and incremented the version for MSI, and tweaking the bootstrapper to allow installation if "Obsolete" install is detected instead of showing uninstall like before).  I created a new installer (not patch) that contains the correct files, but when I install it, the newer version of third party DLL is still there, while everything else is up to date to correct version.  What am I missing?  Why isn't it removing the entire install before reinstalling, which is what major updates are supposed to do?

This is what I have for MajorUpdate element in MSI:

<MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." Schedule="afterInstallExecute" AllowDowngrades="no" />

I thought "AllowDowngrades" prevents an older MSI from removing a newer MSI's install.  Is this interfering with components as well?

-----Original Message-----
From: wix-users [mailto:wix-users-bounces at lists.wixtoolset.org] On Behalf Of robert_yang at agilent.com
Sent: Wednesday, November 16, 2016 2:42 PM
To: wix-users at lists.wixtoolset.org
Subject: Re: [wix-users] How to downgrade a file to an older version in a patch?

"We've ran into a problem with a third-party dll that requires us to downgrade to an older version (i.e. 5.0 to 4.0).  The patch that upgrades it is already released, so we can't just undo the change.  So this patch needs to remove the newer version and put in the older version in its place."



We would probably just ask users to uninstall patch A, and then install patch B in its place -- I'm assuming here that patch B contains updates to other files.  Uninstalling patch A should restore the DLL to version 4.0.  Then patch B simply leaves the DLL at version 4.0 and makes whatever other changes are needed.



I wonder if there is a way to bundle these two actions together ...

-Rob


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