|After using PSP X4 for a long time, I finally upgraded to the latest and greatest after X4 gave me a dialog with an offer for the Ultimate package for $24.99.
The reason I had stayed with X4 for so long is that past upgrades still didn't support the changes to plugin support, so the free Nik collection wouldn't work with it, and I liked using the Color & Silver Efex I already had. Not enough reason to upgrade. I was able to confirm before buying that 2018 did support the last version of Nik now.
Just thought other PSP users might like to know, if you weren't already aware.
Also had to upgrade my Canon DPP upon getting a Powershot G7x, and the older versions can't read it's RAW files. Lots of changes in that as well. It is slower to render the previews to the screen, but otherwise a lot of nice new features and a revamped interface. I needed a newer, faster PC anyway.