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Hi great plains,
I am not with Laminar Research; just a flight simmer.
The same type of question was asked a few days back. Have a look at the answer provided by jennifer (jroberts) from Laminar Research at http://questions.x-plane.com/14763/is-possible-to-have-evaluation-version-for-windows-in-32bits
XP11 is only 64 bit. I wouldn't go back to XP9. I understand XP8 is no longer available. You will need to purchase from the LR site.
Before you purchase check your PC meets the minimum requirements and hopefully will meet the recommended requirements for a better performance. The requirements can be found at http://www.x-plane.com/desktop/recommended-specs/
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