Thanks everyone for your feedback!
Here is an Apple support link which announces that Aperture won't work after Mojave. It gives info on how to transition to either Photos or LRClassic. Since they abandoned Aperture, I don't trust Apple to continue supporting Photos, which I think is still behind Aperture in capability. So I am thinking about LRClassic (plus others you have suggested), but there are caveats like how to capture all of the work that went into Aperture image adjustments:
"Aperture and Lightroom use different image processing engines, so Lightroom cannot read adjustments made in Aperture.
Options:
- Reedit your file using Lightroom Classic.
- Use Aperture to export full resolution edited photos and store them with the originals."
https://support.apple.com/en-us/HT209594Regarding urgency, transitioning to LRClassic using the first method doesn't
seem to require Aperture to be operational, but looks like a huge amount of work to re-do the adjustments in LR.
The second method requires Aperture to be operational (to do the export), thus needs be done before upgrading beyond Mojave.
When importing pictures into Aperture, Under "Store Files" i always selected "In the Aperture Library", so the Aperture library(ies) are managed, not referenced. So I know where everything is. When the first one got too big, I started a second this year.
https://discussions.apple.com/thread/5738480QUESTIONS:
1. Does anyone know whether a means exists to extract edited pictures and metadata from Aperture Libraries without using Aperture, provided you can find the aperture Libraries?
2. When they say "Use Aperture to export full resolution edited photos and store them with the originals", would you just export versions, originals, and metadata to a Mac folder?
3. Would the above include jpeg+raw files?
Thanks.