Welcome @skmw, I found the following information on the Apnea Board Forum...
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You can get a copy of ResScan (the ResMed software) over at http://www.apneaboard.com/forums/

If you are not a member over at apneaboard, you will need to register since the instructions for getting ResScan is in the Private, Members only area. It's free to register. If you have trouble finding the instructions to get a copy of ResScan, post to the forum over there and someone will help you.
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What type of ResMed CPAP do you use?