[handmade two]

I am new to WordPress and I purchased the premium package from Obox theme: handmade two. I am having problems getting the demo to upload. When I click on the Demo icon it was taking me to a broken link. I contacted the support team and the creator sent me the XML file to upload into WordPress. When I tried to upload all I received was a failure notice and that “does not appear to be a WXR file, missing/invalid WXR version number”. I tried using a different theme template with the same end result. Does anyone know how to correct this? I am lost as to what I can do to correct this problem? Thank y’all so much in advance for any advice that you can give me in this matter.