【Xbox Series X|S/Virtua Fighter 5 R.E.V.O. World Stage】How do I transfer the data from the "30th Anniversary Wallpaper Set" included in the 30th Anniversary Edition to a PC or smartphone?

First, launch the dedicated app for the Pre-Production Materials & Soundtrack.
The last page of the Pre-Production Materials is a page about downloading the wallpaper set.

You will find a URL, a QR code and ID/password there, so that you can access and download the content on your PC or smartphone.