There is no official Forza Horizon 4 update or build number matching the specific sequence or 1478564 . These numbers appear to be a mix of internal build IDs or user-reported version snippets rather than official Series or Title update nomenclature.
Only download from trusted scene groups. Many fake "e upd" files contain miners or ransomware disguised as the 1478564 patch. forza horizon 4 update 1465282 1478564 e upd
In scene numbering: