On Organize Your Setup in General information you can see install conditions on the product properties item. Anyting there ?

>>I haven't tried ISX yet, but you must have a conditionnal install rules built-in. Just a guess. I know it's possible to do it with the full version.
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>I'm using the full ISX...But I'll take a look, see if I can find something like what you're talking about in ISX.