Next week is my friend’s birthday, and I plan to buy a new laptop for him. I know he likes Transformers very much, so I want to ask a download link of Transformers theme of Windows 8. If you guys know where to download that, please reply me. Thank you very much
ANY Windows 7 theme is cross-compatible with Windows 8. However, maybe I don't understand what you're saying here? Do you want a Transformers (as in the movie) theme for a leaked build of Windows 8? If so, use any Windows 7 compatible theme. If you want a modification to make your friends PC look like Windows 8, such a thing doesn't exist (and from my experience using Windows 8, there's not that much different anyway).
I hope this helps. Oh, and welcome to Windows8Forums.com