This is not an unusual thing for Falcom, as they often rerelease the PC titles as new operating systems come around. One thing that’s noticed, though, is a lack of a lot of their regular titles being updated: Zwei II, Xanadu Next, and the Kiseki titles.
They are each now available on Falcom’s online store for 3990 yen each.
[ Ys VI the Ark of Napishtim @ the Falcom Online Store ]
[ Ys the Oath in Felghana @ the Falcom Online Store ]
[ Ys Origin @ the Falcom Online Store ]
[ Ys I & II Chronicles @ the Falcom Online Store ]