There are some incompatibilities, and I personally would not update if I were in your situation. PS 5.5 works, but will always crash if you use the File Info. (A good way to lose all your work up to that point - save you're work often!). So far, it seems to work otherwise, although when I quit the program, it closes down very quickly and about a minute latter a notice comes up that PS shut down unexpectedly. It did freeze the computer once. Also, if you quit the program, it will not ask you if you wish to save the changes.
Download the latest version of Adobe Photoshop for Mac - Professional image editor. Read 161 user reviews of Adobe Photoshop on MacUpdate. A Performa Power PC running Mac OS 7.2. I now use Photoshop CS with the Photographer's package, which included Photoshop, Lightroom and Lightroom Classic for $10 a month. I have Photoshop CS5 and as. :) This is good advice, although Adobe Photoshop CS5 can actually be installed as a 64-bit version. Regardless, I'm with you on this. Users going forward who don't want to opt-in to Adobe's subscription model will need to either not upgrade macOS, purchase Photoshop Elements (which for most users would probably suffice) or move to a non-Adobe. In 64-bit versions of Mac OS 10.5 and later, some older, optional plug-ins are available only if Photoshop is running in 32-bit mode: In the Finder, choose Go Applications. Expand the Photoshop folder.
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Aperture also seems to have some issues for me with crashes when exporting originals with IPTC (but not versions, or originals without the IPTC added), or when trying to 'Write IPTC to Originals'. Good to know if this will affect your work flow with your photos.