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Fill the Resending form to have your license key emailed again to you.
To check your eligibility for upgrading to version 6, see the upgrade info page.
If you purchased Photomatix Essentials you can upgrade to Photomatix Pro from here.
For queries on a licensing, registration or ordering issue, you can expect an answer within 24 hours. For other queries, you should receive a reply within one to two business days, depending on the query's complexity.