I just installed the new version of Photoshop 2023, extension legacy is not longer available. I have luminosity plug-ins that I need that are no longer available to me. They are ADP and Mono FX. I am working on a Mac Studio computer. I would appreciate any help to resolve this issue.
I'm having the exact same issue. I'm on a 2019 MacPro tower running Big Sur. I just installed Photoshop 2023 and did the right click on the actual app icon and Get Info and under the General section there is no option to "open using Rosetta". Nex to Kind my version says application universal. As a professional illustrator I've been using an absolutely indispensable extension called Brush Box which I cannot use. Previous psd versions allowed for extensions to be loaded.