New Post: Installed updates continue to want to be installed

isinstalled:

<msiar:MsiProductInstalled ProductCode="{1f5e5f2e-5e61-431d-b796-58ccc6b68e28}"/>

isinstallable:

<lar:Not>
<msiar:MsiProductInstalled ProductCode="{1f5e5f2e-5e61-431d-b796-58ccc6b68e28}"/>
</lar:Not>