Licence key for A+ 3

I’ve just deleted 2.6. Have installed trial of 3 but how do I get license key? Only seem to have licence file and key being asked for doesn’t seem to be included in any Avangate details on my account. I am fully entitled to upgrade to 3 having bought 2 well after Christmas 2016. Any help much appreciated.

Then just follow the upgrade path on buy now then upgrade now.
After entering your Audirvana Plus 2 order details to validate the upgrade you’ll receive your Audirvana Plus 3 license key for free.