If you want installation files to go along with your purchased serial number
a. Adobe other downloads
When you purchase from other than Adobe, you must deal with the seller for returns, exchanges, refund.
Adobe sells only the download, no disc.
Suggested Best Route...
Go to the seller for a replacement according to its policy and replacements, you will then have a new serial number and installation disc for product on Windows and Mac rather than downloaded installation files specific to the computer operating to which they are being downloaded.