I recently upgraded to Windows 10 and replaced my hard drive. The old drive was mirrored to the new one. Opus is now on a 60 day evaluation certificate. I have 10.5.7.0.5215. I havent upgraded to version 11 because 10 is working fine for me. I am ready to upgrade to 11 but want to pay the "upgrade" price and not the full price. I cannot find my previous certificate number. I don't remember the email I used many years ago when first installing Opus. I used a current email I have when the 60 day evaluation was forced on me. What do I do next?