I seem to remember some tidbits in code about burn self-updating. 

>From http://robmensching.com/blog/posts/2012/8/21/Enter-WiX-v3.7-toolset, 

In WiX v3.7, there is a new option in Burn to plan an "update". If your 
Bootstrapper Application detects a newer bundle is available, it can tell the 
Burn engine about the update then the engine will download (if necessary) the 
update and launch the updated install just like it was one of the packages in 
the chain.

So I would say take a look at the Wix BA and see how they are doing it.

As far as swapping out MSI's on the download server, I would advise against it. 
What I would do is have your RTM version on the server, followed by a chain of 
patches (MSP) to update.  Every time you introduce a new patch or MSI, you want 
a new version of your bundle with an incremented version number. This should 
prevent your users from running an older version of your bundle when a newer 
one is already installed.

-----Original Message-----
From: Amadeus [mailto:amadeus.h...@diadrom.se] 
Sent: Thursday, November 22, 2012 4:02 AM
To: wix-users@lists.sourceforge.net
Subject: [WiX-users] [Burn] "Updating" package without rebuilding

Hello,

We have the following scenario: We need to deliver our Installer on a DVD.
The Installer will download the installation packages from our web server.
By the time our DVD reach our users, the installation packages will have 
received updates (to minor version).

We want to be able to simply replace the installation packages on the server 
using the same URL path as the installer on the DVD looks for. When our users 
install from the DVD the Installer will get the latest packages as they have 
been updated on the server.

However, it seems that Burn is doing some sort of hash (I think) verification 
on the packages, and if they're not exactly the same as when it was built, it 
fails to initiate the installation. Is there away to suppress this?



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