This might not seem particularly “blog-worthy”, but I thought it just might be, since for a very long time I have been laboring under the misapprehension that the highest version of Photoshop that I could run on Mac OS 9.x was Photoshop 6. At various times over the life of this blog, I have brought you information on the highest version of Photoshop that would run on a 68K Mac (Photoshop 4), the highest version of Photoshop that would run on a PowerPC Mac (Photoshop CS4) and in today’s post, I complete this trilogy by bringing you information about the highest version of Photoshop that will run on the last version of Mac OS Classic – Mac OS 9.x.