There's another thing that confuses me:
When you own the "standard" part of a single instrument, and you're adding the "extended" part of the same product later on, you pick the "full" library and the basket automatically calculates your price so that you're only paying for the extended part. This makes perfect sense - you're only paying for the part that you don't own yet.
But this suddenly doesn't work any more when you own the "standard" library as part of a whole instrument collection. I have the Woodwinds 1 standard library. I could upgrade to the "extended" Woodwinds 1 collection and would only be charged the extended portion, as above.
But if I only wanted to upgrade, for example, the Flute 1 as a single instrument - unlike in the cases described above, it charges me the standard as well as the extended portions, even though I already have the standard one. Is that intended?