You can copy your Poser 7 content if you want, or you can just add that library to your current one. 

In your Poser 13 library click this button

Navigate to your library where it says runtime. (Used Poser 12 since I don't have a runtime called Poser 7) Click on the folder that contains the runtime.

Hit select folder. Give Poser a moment or 2 to work. That might take a little time depending on your hardware and the size of the runtime.

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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.
Check out my store here or my free stuff here
I use Poser 13 and win 10