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    <p>I suspect this has something to do with the builtin Cassini / Visual Studio Development server and SL5 not playing nicely together for some reason. </p> <p>I'm also using the anti-cache trick you mentioned and I was experiencing the same behavior of <strong>Application.Current.InstallState</strong> always reporting <strong>NotInstalled</strong> as well as <strong>CheckAndDownloadUpdateAsync()</strong> always reporting <strong>e.UpdateAvailable = true</strong>.</p> <p>So I changed my web project configuration to use <strong>IIS Express</strong> instead of the the builtin Visual Studio Development server and re-installed the Silverlight app to the desktop. Finally, everything started working as expected. In order words <strong>Application.Current.InstallState = Installed</strong> and <strong>CheckAndDownloadUpdateAsync()</strong> is reporting <strong>e.UpdatedAvailable = false</strong>.</p> <p><strong>Update</strong>:</p> <p>Sorry, didn't see that you're experiencing this as well on live IIS deployments.</p> <p><strong>Update 2</strong>:</p> <p>My anti-cache HTML as requested:</p> <pre><code>&lt;div id="silverlightControlHost" align="center" style="height:100%"&gt; &lt;object data="data:application/x-silverlight-2," type="application/x-silverlight2" width="100%" height="100%"&gt; &lt;% string source = @"~/ClientBin/EskomVDT.SL.xap"; string param; if(System.Diagnostics.Debugger.IsAttached) { param = "&lt;param name=\"source\" value=\"" + VirtualPathUtility.ToAbsolute(source) + "\" /&gt;"; } else { string xapPath = HttpContext.Current.Server.MapPath(source); DateTime xapCreationDate = System.IO.File.GetLastWriteTime(xapPath); param = "&lt;param name=\"source\" value=\"" + VirtualPathUtility.ToAbsolute(source) + "?ignore=" + xapCreationDate.ToString("yyyy-MM-dd-hh-mm-ss") + "\" /&gt;"; } Response.Write(param); %&gt; &lt;param name="onError" value="onSilverlightError" /&gt; &lt;param name="background" value="white" /&gt; &lt;param name="minRuntimeVersion" value="5.0.61118.0" /&gt; &lt;param name="autoUpgrade" value="true" /&gt; &lt;a href="http://go.microsoft.com/fwlink/?LinkID=149156&amp;v=5.0.61118.0" style="text-decoration:none"&gt; &lt;img src="http://go.microsoft.com/fwlink/?LinkId=161376" alt="Get Microsoft Silverlight" style="border-style:none"/&gt; &lt;/a&gt; &lt;/object&gt;&lt;iframe id="_sl_historyFrame" style="visibility:hidden;height:0px;width:0px;border:0px"&gt;&lt;/iframe&gt; &lt;/div&gt; </code></pre>
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    1. POSilverlight 5 - OOB install/update broken when using anti-cache trick
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    1. COWell, for the installation detection part, you're right, the embedded server was messing up worse than IIS (or an unknown PHP provider on a client website). But my real problem is the update detection, which sadly persists.
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    2. COAs this was the only answer with something like a solution, I awarded the bounty, although it doesn't solve my problem.
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    3. COCould you show your own anti-cache code? Or at least the resulting HTML?
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