If you can't find the email you received right after purchasing the aircraft, you can always your serial number / registration key by logging into your Alabeo account ("My account") and clicking on the "My products" tab.
Where can I find my serial number / registration key?
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I purchased the C177 Cardinal last fall (9/30/16) -- and then forgot about all it. I tried to install today, using the serial number shown in my Alabeo account.
The installer says the number is invalid. I tried twice. YES, I AM SURE I entered it correctly.