Windows 8 build 8520

Windows 8 build 8520 is a build of Windows 8, which was uploaded to BetaArchive on 3 February 2020 in the x86 and ARM32 architectures only in the Czech and Traditional Chinese (Hong Kong SAR variant) languages respectively.

Changes

 * Reverted the set of wallpapers to the ones included in earlier builds.
 * The Start screen backgrounds used in the RTM are introduced.