where is the stacks 3 registration number to copy to my new computer?
Contact Yourhead support, they will help you.
http://yourhead.com/support
I am not sure the exact location of this has ever been revealed.
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What you can try in the meantime, is searching your email and hard drive for “yourhead” and “stacks”. That always brings up my purchase email, which has my key code in it.
I emailed yourhead and they sent them.