You would need access to the kickstarter/paypal email address used to link it to a Larian Vault account. If you are not really you when you enter your email address, the real you would get the email (which gives the name of the Vault account making the request, the verification link and instructions to click the link if you made the request or to contact Larian if you did not).
That's good to know. I'm itching for an update. At last, we'll have one on monday!