Yes, that should be fine. Larian should still get the email address you used, so they will be able to contact you, and allow you to manage your tier rewards (when they finish upgrading the Larian Vault website in a few weeks). If there is a problem, though, they would still be able to look up the Paypal transaction number to confirm your pledge (Paypal would have provided that in the conformation email; I'm not sure if you can look it up if you don't have an account).
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