Rendo has had the downloads available for Poser 11 since they bought it. https://www.posersoftware.com/downloads/11

I have it installed to this day to use the older scripts to make and test content in it. 

And just so you know, the current version of Python in Poser 13 has been retired as well. There is not much Poser can do about that either. Python support is usually only 3 years per build.

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