The purchase of both volumes is completed, and Historic Winds I is downloading as I write this (Historic Winds II will be available for download later in the month).
All of the Vienna software products (except Vienna Suite) have been updated recently -- I thought it was so that they are aware of this new library, but the change logs mostly talk about macOS Sierra compatibility fixes -- it is probably a good idea to update MIRx, VE, VI, VE Pro, VI Pro, Download Manager, etc.
Note that you can't use a voucher if it is more than the amount due, so anyone buying eight-for-six (in two batches of four-for-three) will have one voucher left over and a bill of 90 euros to complete the purchase of both volumes of Historic Winds.
Around the holidays, I'll probably buy a few more vouchers, and then I'll be all set for Historic Winds III and one or two other products as 2017 rolls along.