And now, to present today’s additions to the 4xblu online store: Julio Medem’s “Sex and Lucia,” Peter Greenaway’s “The Baby of Macon,” and Alfred Hitchcock’s “Downhill.” One of the “Hitchcock 9” (the nine silent films directed by Alfred Hitchcock that have not been lost to the ravages of time) that was restored by the BFI a few years ago, “Downhill” concerns the demise of Roddy Berwick (played by Ivor Novello, who’d starred in Hitchcock’s “The Lodger” a few months earlier), a college student whose life spirals downward after he takes the rap for a buddy and gets expelled.