Regrettably, Riven still wouldn't run, as it required display hardware that could display thousands-of-colors. Bummer.
With a new PC many years later, I finally played it. It was one of those experiences where I wish I could forget it, so I could play it again. I tried again decades later, (after having played and loved all the other Myst games; IV was my favorite; outstanding atmosphere and scope; especially the starting and starry worlds). Regrettably, I still remembered how to solve almost every puzzle, and remembered the map layouts in detail. However, I remembered absolutely none of the plot of dialog!
(The latest Myst re-releases are worth a play through too, as is Obduction. My favorites are still Riven and Myst IV though!)