I'm pretty sure input for that has all been deactivated in the Vault. It couldn't hurt to try emailing kickstarter@larian.com, though.
There was a problem implementing the kickstarter potion, so the effect was just added as soon as you create a profile using the kickstarter code. You'll have the code, even if it is just the basic golden grail and Zandalor's trunks that all kickstarter backers got.
