Lost product key

I would like to instal the program on my new computer but unfortunatelly I cannot find my product key … 
However I have still Endnote installed in my old PC,  Is there any possiblity to get a product key  from my  already working endnote App on PC?
How can I get it?
All the best 

Suliman 

and btw, its not in the confirmation email :frowning: