Photo Ninja runs perfectly under Linux (Mint 19.3 using the WINE wrapper). RawTherapee and Darktable are native Linux programs. So is Gimp, if you can adjust yourself to it
My install of Monochrome2DNG likewise went smoothly. I tried to get PS-CS2 up and running, but the installation crashed. Same with CS6, which according to rumours should be OK.
Win10 has been a
very mixed blessing. Some upgrades went without hiccups, others on the exact same hardware did not. I had to revert to Win7 on my main work station as Win10 developed annoying issues - not being able to copy files, for example
I also have had serious sound troubles on two different machines which thwarted my attempt to use either of them for video & net-based meetings. Scratched Win10 on one of these and installed Linux (Mint 19.3). All tasks thereafter sailed smoothly through, no more sound issues. Zoom and Teams installed perfectly and this is now my main resource for virtual meetings. The second Win10 box with sound issues has been demoted to a control box for remote teetering. Those other machines that run Win10 without issues have been given a temporarily lease to continue doing so.
Why am I amazed over Microsoft's offerings, given their track record??