Photoshop 10 How do i get a code to reinstall product

"Photoshop 10  I did a reset on windows 10 machine & it wiped out my Photoshop & element.  when I go to reinstall it states redemption code has already been used.  How do I get a code to reinstall because I love the product & want to continue using it"

How do i get a code to reinstall product.  I screwed up & wiped it out when I did a reset.  I thought it stated it would keep products.  It kept some & not others   I do like the photoshop 10

[title cut back by ussnorway]