For a while, I was using both a desktop and a laptop for poser. I had the software installed on both computers and then put all of the runtimes on an external drive that I pointed both computers to.

As for how many computers you can install it on, I've seen both 3 and unlimited. I think 3 was stated before Poser 12 came out. Unless you've already verified it, I strongly recommend contacting the marketplace or support for clarification.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10