where is my transmutr license key

when I just buy transmutr, I have got two email in my inbox, one is my invoice and the other is the file installation with license key, but the problem occur when I see that the License Key is error.
So then where is my License Key?
please give the solution soon

Hi @youngming ,

I just sent you a key by private e-mail.

We were having technical difficulties with license generation, sorry for the inconvenience.

Ok, received and thanks a lot