Adobe Première Elements 2020 & Photoshop Elements 2020

Hi,

A few years ago I purchased Adobe Première Elements 15 & Photoshop Elements 15. The serial numbers don't work anymore, it seems I have to upgrade to a recent version.

When I purchase an Upgrade License, what will I need during the installation, the old serial numbers (that differ per application) or will Adobe use another method to verify I can use the Upgrade License (instead of a New License)?

Thanks in advance,

SJW