Yes, in this case scheduling RemoveExistingProducts before
CostInitialize should solve the problem if it's related to this:

http://support.microsoft.com/kb/905238/en-us

where MSI decides not to install the file but forgets that a major
upgrade is going to remove it. There was a thread on the subject
recently that a search for -RemoveExistingProducts - should find.
---------------
Phil Wilson


On Wed, May 28, 2014 at 3:25 PM, Rob Mensching <r...@firegiant.com> wrote:
> Schedule RemoveExistingProducts very very early?
>
> _______________________________________________________________
>  FireGiant  |  Dedicated support for the WiX toolset  |  
> http://www.firegiant.com/
>
> -----Original Message-----
> From: Jesper Alf Dam [mailto:j...@medical-insight.com]
> Sent: Monday, May 26, 2014 3:37 AM
> To: wix-users@lists.sourceforge.net
> Subject: [WiX-users] Best approach to override file versioning
>
> We have a product that ships with a number of independently versioned 
> third-party libraries, in addition to our own files (whose file versions 
> follow the product version)
>
> Now, we've encountered a situation where some of the third party files we 
> want to ship in our installer have a lower version than the ones used in our 
> previous release.
>
> This means that when a user tries to run the installer to upgrade the 
> product, the following happens:
>
> 1. during the "costing" step, MSI figures that it already has a newer version 
> of the file than the one we're trying to install (and therefore, there is no 
> need to install the file from our installer) 2. MSI then uninstalls the old 
> product version, removing the *newer* version of the file 3. MSI then 
> installs the files from the new product version, except for the ones that got 
> filtered out in step 1
>
> The end result is that we get the new version of our product installed, but 
> without the files whose versions were bumped "down". The existing version of 
> those files has been uninstalled, and the version from the installer has been 
> skipped, leaving us with neither. And this leaves us with a product that 
> doesn't actually *work*.
>
> This process strikes me as pretty obviously broken, but that is a matter for 
> the Windows Installer.
>
> Here and now, it is only a couple of files that have this problem, and we 
> could handle those as a special case, but we would like to find a general 
> solution that ensures that "whatever we have in the installer gets 
> installed". We ship a set of files that have been tested together, and which 
> form a complete, coherent product, and if, at some point in the future, we 
> again choose/need to ship a few files whose versions have decreased since the 
> last release, then we don't want to have to special-case that to make sure 
> the right files get installed.
>
> We would like to ensure that if newproductversion > oldproductversion, then 
> *all* files from newproductversion get installed.
>
> Note that all our files are installed locally for our product only. We don't 
> install any shared DLLs, where versioning would obviously be more 
> complicated. In our case, we really just want WiX and MSI to base their 
> decisions on the product version, not the file versions, for all our files, 
> now and in the future.
>
> What would be the best way to achieve this?
>
> We could use REINSTALLMODE=amus, but that seems like the sledgehammer 
> approach. It is my understanding that this property is intended for 
> administrative installs to specify, rather than something that should be 
> burnt into the installer itself. Is there a better approach?
>
>
> Thanks,
>
> Jesper
>
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