I have already contacted Perkopolis about this and they told me to get in contact with a Turbo Tax directly.
Unfortunately, Perkopolis gift cards cannot be used to purchase TurboTax. Here's the Perkopolis webpage that outlines what can be purchased with those gift certificates: http://shopping.na3.netsuite.com/s.nl/c.851077/it.A/id.17706/.f