You can't, due to Adobe removing all download links for old programs
Adobe USED TO HAVE a way to re-download a program IF you purchased a download direct from Adobe, but that was removed 2 days ago
THIS NO LONGER WORKS... you may download ONLY if you bought direct from Adobe via download -Log-in to your account and click this link https://account.adobe.com/products --click Order history on the left and then the link to your order that will show on the right --and finally click the link "Downloads and serial numbers" that will appear --as always, write the serial number in a text file AND copy that text file and the ---download file(s) to an external drive (or two) to be sure you have what you need -if you did not buy direct from Adobe via download you must find your original install --if you have an Education or volume license you MUST use your original media --the link for an Education or volume license download is not available at all -if you bought a disc and don't have a drive you will need to buy an external USB drive -if you bought a download from a 3rd party vendor you will need to contact that vendor
Clusterduck, not as bad as you may think. If you're running Windows 10 or the latest Mac OS X 10.15, for example, PSE 8 isn't compatible anyway. The good news is the 25% discount you can get on Photoshop Elements 2020 until 4/19.