Their phone number is on their front page ([http://www.cadsoftusa.com/), and when I called them I got to speak with a real person right away, so you’d probably get a quick and accurate answer that way.](http://www.cadsoftusa.com/)
The last time I spoke with them, they claimed you had to buy licenses at the same level to interoperate. And I think they even said you had to buy them at the same time, you couldn’t start with the pro layout module and later add on the pro schematic module. Probably something to do with the live back-annotation.
But it’s always worth asking again, this was years ago.
I’m slightly suspicious of a vendor that won’t publish upgrade pricing on their website, when the rest is so clearly spelt out. Seems like they might be milking certain users.
mkissin:
I’m slightly suspicious of a vendor that won’t publish upgrade pricing on their website, when the rest is so clearly spelt out. Seems like they might be milking certain users.