Poser - OFFICIAL F.A.Q (Last Updated: 2021 Sep 26 11:30 am)
Yes, you can have both. I recommend it, since Poser 11 scripts (EZSkin, etc.) don't work with Poser 12. Most of us who upgraded are running both versions. You can even run both at the same time. (Don't try to render while doing that, though.)
There's 21 day free trial, so you can check it out for yourself.
I use both together all the time, going as far as having Poser11 rendering something using my CPU while Poser12 renders something else using my GPU at the same time :)
They play together very well.
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Feel free to call me Ohki!
Poser Pro 11 and Poser 12, Windows 10, Superfly junkie. My units are milimeters.
Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 64gb ram.
It may be best to back up any valuable custom presets, expressions, script sets etc, just in case:
C:|Program Files|Smith Micro|Poser 11|Runtime|prefs|RenderPresets|
C:|Program Files|Smith Micro|Poser 11|Runtime|Python|poserScripts|ScriptsMenu
C:|Users|Public|Documents|Poser 11 Content|Runtime|Libraries