I am not with Laminar Research; just a flight simmer.
Have a look at the following link to answer your question found at https://www.x-plane.com/kb/x-plane-9-system-requirements/
Unless you already have a copy of X-Plane 9 I am of the opinion that it is no longer available having seen a similar question or advice given in this forum some time back.
Also have a look at the answer from Jennifer (jroberts) provided in the following link at https://questions.x-plane.com/17732/program-stops-responding-in-demo
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