As you said the installation did not require any product key. Download of the iso file and installation went smoothly; even better now. Thank you

I am downloading x86 insider preview build 10547. I am directly downloading it from the archive and I will need the product key while installing; can you tell me what it is?

Thanks Brink, this one did work for me.
thank you.

This key also does not work for me. It says my product key looks something like this "*****-MKKG7"