Can't install purchased Humble Bundle package "shatter"

[Bernie Innocenti]

After purchasing Humble Bundle 6, I was directed to the software center site:

  https://software-center.ubuntu.com/coupons/hib6/?key=<EDITED>&download_app_id=457

I click on the link for the game Shatter, which links to

  apt://shatter

The Software Center opens, and says:

  There isn’t a software package called “shatter” in your current software sources.

[Bernie Innocenti (codewiz)]

If I manually type "shatter" in the search box, then I can find the package.

If I click the "Buy" button next to the result, I'm prompted to sign in. After that, I have to click "Buy" once more, and nothing seems to happen. After a while, installation starts in the background and the only hint is the rotating animation on the toolbar.

Note that clicking "Buy" in the Software Center seems wrong in the first place, because at this point I've already paid once.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ilya Shaisultanov (diversario)]

software-center.ubuntu.com/coupons doesn't even exist anymore - 404 page displayed.