I am sorry you are having this trouble but let me help you.
As you mentioned, the supported Operating Systems are Windows 7, Windows 8/8.1 only. This is a very new product and you may encounter problems during the installation of a non supported Operating System but you can also try another XP image.
Something you can also try is installing one of the supported Operating System and then install a virtual machine running Windows XP.
Here you can get more information about this:
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