My Photoshop Elements 15 Disk Envelop Serial Number

Good day,

I purchased Photoshop 15 for Mac via Ebay.  I no longer have the box, but retain the envelop.  There are several numbers on a small sticker located on the rear lower right; however, none of them fit the 24 number requirement for a serial number.  I am attempting to install but can't get through the serial number step.  Please advise.

Respectfully,

DMH