From "Preview" to the activated theme

I installed the theme “Inspiro” Ver 1.7.3. but when I click on “preview” I have the page with all its content: images and animations. but when I activate the theme, I have a page that does not look like with the “preview”!
importing the “demo data” does not work on his website.

  • where is the problem please?
    ** this is the video who explain all
    inspiro - YouTube