This question may be unrelated to this forum but I've really got no one else to ask so I hope at least someone will be able to take the time to help me.
I've customized my atahualpa theme but changed webhost. I downloaded my entire wp-content (which includes the atahualpa theme and all my images etc etc) but when I upload and activate it in the new wordpress, the default theme comes up (eg. all my customization gone).
Does anyone know what happen and can help me? The webhost say they can't help me because it's out of their scope

Any help is appreciated. Thanks!