Your new Mac is running macOS Catalina. The only version of Elements supported on Catalina is the current version 2020.
All previous versions of Elements qualify for upgrade pricing.
It's a simple process.
- You buy the upgrade version of Elements 2020 and install it (no need to try and install Elements 14 first - it won't install on Catalina anyway),
- Enter your upgrade serial number (for the 2020 version)
- Enter your Elements 14 serial number (to verify you're eligible to use the upgrade serial number).
Shop around though. You'll often find the price of a brand new (not upgrade) version of Elements is cheaper than the upgrade version. One advantage of the brand new version is that, when reinstalling, you only need one serial number - the previous version serial number is not required.
Note: the upgrade version and the brand new version are identical in all respects. The price and some license conditions are the only difference between them.