title: Why does ClickOnce setup abort with error: an error occurred trying to download <AppName>.application
body: <p>I have look at tons of comments and suggestions about solving this ClickOnce Setup problem but have NOT found a solution.</p>
  <p>Advanced Security check did not work because the item &quot;warn if changing between secure and non-secure mode&quot; is not checked!</p>
  <p>The URL for the .application file is correct.</p>
  <p>I have deleted the ClickOnce files and folders several times and republished the application in Visual Studio but that didn't solve the problem.</p>
  <p>Can someone suggest a solution that is tried and true?</p>
  <p>Thanks.</p>