Can I still keep my Poser 11 if I upgrade to Poser 12? Can I run the two versions side-by-side on the same machine? I would like to get Poser 12 but I don't want lose the specific features of Poser 11 like the Face Room and older Python.

Yes. I have P12, P11 and P2014 on same computer.

The one issue may be when you try to open a scene made with later version in an earlier program, outside of that it works just fine.

Thanks! Excellent news!

While you can run two or more versions at the same time do not try to render at the same time as it will cause a conflict between resources.  Also if you use the Queue Manager be aware that they only work with a specific version of Poser and you have to use the Exit option to fully shut it down.  Just clicking the Upper X makes it disappear however it is still running and if you run Poser 11 QM then work with Poser 12 it will give weird results. 

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13

Just allow them to install into their own default folders.

Thanks. This is all good information.

Richard60 posted at 3:52 PM Tue, 24 January 2023 - #4454567

While you can run two or more versions at the same time do not try to render at the same time as it will cause a conflict between resources.

I've been successful - many times - on rendering in P11 on CPU while rendering in P12 in GPU/Optix. :) can be done if you have two separate resources.

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.