I completely sympathize with Mr. Devereux. Which is why I ran SheepShaver up until I upgraded to El Capitan. SheepShaver won't run on anything later than Yosemite. And the SheepShaver developers have abandoned it, to my everlasting sorrow.
SheepShaver was a real pain in the butt to get configured just right anyway.
This is why I justify keeping my G4 MDD in a corner so I can still run legacy software that I can't or won't upgrade. The last time I dumped a lot of coin into Adobe's pockets was when I ponied up several hundred dollars to purchase the Creative Suite 4 Master Edition. After paying Adobe thousands of dollars over the years for Photoshop and Illustrator upgrades, enough was enough. And there is no way in hell I'm going to rent software from Adobe.
Besides, with every Photoshop upgrade, there are so many new features it would take me a decade to learn, use or let alone, appreciate. For that matter, Photoshop Version 3 was probably my favorite version since it did everything I needed with simplicity and speed, and without being a resource hog. And it was always another pain in the butt to learn how Adobe had re-arranged/changed commands, features, etc.