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    <p>Can you elaborate what kind of tools are you using to create this installer?</p> <p>I use Windows Installer XML(<a href="http://wix.sourceforge.net/" rel="nofollow noreferrer">WIX</a>). In WIX you could do something like this:</p> <pre><code> &lt;!-- Property definitions --&gt; &lt;?define SkuName = "MyCoolApp"?&gt; &lt;?define ProductName="My Cool Application"?&gt; &lt;?define Manufacturer="Acme Inc."?&gt; &lt;?define Copyright="Copyright © Acme Inc. All rights reserved."?&gt; &lt;?define ProductVersion="1.1.0.0"?&gt; &lt;?define RTMProductVersion="1.0.0.0" ?&gt; &lt;?define UpgradeCode="{EF9D543D-9BDA-47F9-A6B4-D1845A2EBD49}"?&gt; &lt;?define ProductCode="{27EA5747-9CE3-3F83-96C3-B2F5212CD1A6}"?&gt; &lt;?define Language="1033"?&gt; &lt;?define CodePage="1252"?&gt; &lt;?define InstallerVersion="200"?&gt; </code></pre> <p>And define upgrade options: </p> <pre><code>&lt;Upgrade Id="$(var.UpgradeCode)"&gt; &lt;UpgradeVersion Minimum="$(var.ProductVersion)" IncludeMinimum="no" OnlyDetect="yes" Language="$(var.Language)" Property="NEWPRODUCTFOUND" /&gt; &lt;UpgradeVersion Minimum="$(var.RTMProductVersion)" IncludeMinimum="yes" Maximum="$(var.ProductVersion)" IgnoreRemoveFailure="no" IncludeMaximum="no" Language="$(var.Language)" Property="OLDIEFOUND" /&gt; &lt;/Upgrade&gt; </code></pre> <p>Then further you could use <code>OLDIEFOUND</code> and <code>NEWPRODUCTFOUND</code> properties depending on what you want to do:</p> <pre><code>&lt;!-- Define custom actions --&gt; &lt;CustomAction Id="ActivateProduct" Directory='MyCoolAppFolder' ExeCommand='"[MyCoolAppFolder]activateme.exe"' Return='asyncNoWait' Execute='deferred'/&gt; &lt;CustomAction Id="NoUpgrade4U" Error="A newer version of MyCoolApp is already installed."/&gt; </code></pre> <p>The above defined actions have to be define in <code>InstallExcecuteSequence</code> </p> <pre><code>&lt;InstallExecuteSequence&gt; &lt;Custom Action="NoUpgrade4U" After="FindRelatedProducts"&gt;NEWPRODUCTFOUND&lt;/Custom&gt; &lt;Custom Action="ActivateProduct" OnExit='success'&gt;NOT OLDIEFOUND&lt;/Custom&gt; &lt;/InstallExecuteSequence&gt; </code></pre>
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    1. POHow can I determine that Windows Installer is performing an upgrade rather than a first time install?
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