That was me, and I’ve now double-checked to confirm that I bought and installed all six Pilot Plus airports (Wycombe, Oxford, Swansea, Southend, Biggin Hill and Bristol) from Orbx over the years.
I have now copied those from my 2020 Community folder to the new one I created for 2024, and have just tested Oxford for you.
Seems to work just fine, though the grass is a bit long and it has those silly big blue taxi lights that the new sim puts in. Did not have time to try out the sole ILS approach here, sorry. (Excuse the wrong runway in the screenshots below - this was purely a quick visuals, night lighting and taxiway bumps check.)
I’d say you are good to go with buying this in any current sale and then using it in 2024. But please don’t blame me if it does NOT play along nicely down the track somehow…