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    copied!<p>What does your <code>&lt;RemoveExistingProducts After=""&gt;</code> step look like? It could be that the removeexisting is running after the install -- and removing all files that were the same in the previous and current versions.</p> <p>I have my installer set to <code>&lt;RemoveExistingProducts After="InstallInitialize"&gt;</code> to make sure it's done before anything else. I don't know if it's right or not, but it seems to work.</p> <pre><code> &lt;Upgrade Id="$(var.UpgradeCode)"&gt; &lt;!--Upgrade code found at http://www.nichesoftware.co.nz/blog/200809/upgradable-msi-installations-with-wix --&gt; &lt;!-- Detect any newer version of this product--&gt; &lt;UpgradeVersion Minimum="$(var.version)" IncludeMinimum="no" OnlyDetect="yes" Language="1033" Property="NEWPRODUCTFOUND" /&gt; &lt;!-- Detect and remove any older version of this product--&gt; &lt;UpgradeVersion Maximum="$(var.version)" IncludeMaximum="yes" OnlyDetect="no" Language="1033" Property="OLDPRODUCTFOUND" /&gt; &lt;/Upgrade&gt; &lt;CustomAction Id="PreventDowngrading" Error="Newer version already installed"&gt;&lt;/CustomAction&gt; &lt;InstallExecuteSequence&gt; &lt;!-- Prevent Downgrading--&gt; &lt;Custom Action="PreventDowngrading" After="FindRelatedProducts"&gt;NEWPRODUCTFOUND&lt;/Custom&gt; &lt;RemoveExistingProducts After="InstallInitialize" /&gt; &lt;/InstallExecuteSequence&gt; &lt;InstallUISequence&gt; &lt;!-- Prevent Downgrading--&gt; &lt;Custom Action="PreventDowngrading" After="FindRelatedProducts"&gt;NEWPRODUCTFOUND&lt;/Custom&gt; &lt;/InstallUISequence&gt; </code></pre>
 

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