First, double-check that the album actually has been released (it will no longer say “Pre-order” anywhere on the album’s page) — perhaps the artist ran into a last-minute problem that held up the release. If you’d like to find out what the deal is, you can contact them directly using the Contact link on the album’s page.
If the album definitely has been released, make sure the email isn’t sitting in your spam folder. Next, look for the original receipt for your pre-order — the link in that email can be used to get the full album. If you’re still out of luck, please contact us.