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I understand and consequently suggest that you contact Camptune and see what they have to say about it.

To remove Windows you should use Bootcamp Assistant's "remove Windows" option. Don't use disk utility to remove the partition.
That's if the worst happens.

Good luck with Camptune.
 
Thank you for all the help, it's much appreciated even if we didn't get there in the end but it's very kind of you!
 
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