Aha, the Ilio announcement -- which I just now received by email -- is much clearer, and says you can buy Historic Winds II now and download later, as well as showing the same price in dollars as for euros ($395, which is better than 395 euros but maybe not after CA taxes which must apply).
Maybe I can scrounge up $600 pronto, for eight vouchers. I actually have a couple of Christmas pieces I wrote that use historic winds. :-) So the timing is extra-good. Even without sackbutts.