isinstalled:
<msiar:MsiProductInstalled ProductCode="{57bda5c6-443c-4d65-b233-2823932170ff}"/>
isinstallable:
<lar:Not>
<msiar:MsiProductInstalled ProductCode="{57bda5c6-443c-4d65-b233-2823932170ff}"/>
</lar:Not>
<msiar:MsiProductInstalled ProductCode="{57bda5c6-443c-4d65-b233-2823932170ff}"/>
isinstallable:
<lar:Not>
<msiar:MsiProductInstalled ProductCode="{57bda5c6-443c-4d65-b233-2823932170ff}"/>
</lar:Not>