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I'm not sure what the differences between the two programs are (I'm using 10 and it seems to do everything I want to do), but you may want to go ahead and get the newest version so that you have better tech support, sometimes it's harder to get support on the older versions. PI isn't terribly expensive (always under $100), so it's probably not a lot more to get the boxed upgrade (though I have a cable connection I always get it mailed to me because I like having the factory cd and the user's guide book to leaf through!) than the downloaded upgrade.
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