Windows Vista purchases with iTunes gift card?

From the linked support article:

Windows XP or Vista PCs

Starting May 25, Apple will introduce security changes that prevent older Windows PCs from using the iTunes Store. If you have Windows XP or Vista PC, your computer is no longer supported by Microsoft, and you're not able to use the latest version of iTunes.

You can continue to use previous versions of iTunes on your Windows PC without support from Apple. However, you won't be able to make new purchases from the iTunes Store or redownload previous purchases on that computer.

After May 25, you'll need to use Windows 7 or later with the latest version of iTunes to make purchases from the iTunes Store and redownload previous purchases.

The position seems to be clear. It doesn't say quite where in the process the purchase will be blocked, but just because the store displays in your older version of iTunes there's no reason to think you'll be able to work through a purchase to completion and delivery, or that if can still do so today that you will be able to tomorrow.

tt2

No. It’s no longer possible to access the iTunes Store in Windows XP or Vista; if you’re able to get music on a different computer, you can move it to that PC.

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