I understand you are running 10 year old software, but what I am interested in knowing is WHY?
Yes, they still work, but there have been many improvements and features added over 10 years. You feel no need for these? If you have Affinity, why use 10 year old PS?
Actually 11 years old, going on 12. Still runs fine on Windows 11, as does Illustrator CS 6, which I sometimes use alongside PS (that ship has sailed a looong time ago in Apple land). Not jumping on the CC bandwagon has saved me approx. 8000€. So yeah, cheap....
As to why: The answer depends on the use case. Professional freelance illustrator here, and as a painting tool CS6 is every bit as good as CC. In fact, nothing whatsoever has changed in terms of the brushes palette (let me extend that statement: Photoshop CC is in it´s core still the old Photoshop CS6, with a bunch of new features bolted to every nook and cranny).
For digital photography: I use RawTherapee as main RAW editor, and import the results into PS CS6 for further editing, sometimes going forth and back between both. RT can well be used as an image editing tool, and the feature set in some areas is superior to all else I know.
Affinity Photo is, despite al it´s strong points, a disappointment, unfortunately. The RAW editor is very basic, mildly put.
It´s perfectly possible I may subscribe to the photography plan in 2024. Super resolution and denoise AI are the very first features I´d consider worthwhile.