Hardcover discount after PDF purchase?

I purchased the PDF and decided to buy the hardcover, but I can’t figure out how to get the $10 discount for owning the PDF ahead of time.

Look toward the end of the PDF, around page 265. You’ll see two coupons. One is for a free PDF copy if you bought the hardcover. The other applies to your situation and gives you a code to use at GameSalute.com to get the hardcover discount.