If you bought a lifetime license to the previous version, you can still use the previous version. (That's most commonly what "lifetime" license means... it's called that in contrast to a "subscription" where you can't keep using it if you stop paying.)

Usually people who offer upgrades for life will use those words.

I bought photos and designer for Windows and iPad. My daily driver is now a Mac, and I was hoping for a cyber Monday type sale to pick up a Mac version. This seems good to me, and the sale feels like a nice upgrade discount.