Yes, That's the latest Bryce update. You can also download it direct from DAZ no problem.

Bryce 5.5c Update.

Are there any other applications or programs that you downloaded? Bantam Grass is still barely on the web but well hidden. How about Zenith lighting? If you have it and saved all your Bryce presets you should be allright.

I've had about 3 crashes and a couple of intentional upgrades that lost me some favorite games. Castle Wolfenstein ran quadruple speed when I jumped the hard drive from a 286 to 386. Ken's Labyrinth, Moraff's Dungeon, and MonsterBash all got wiped or wouldn't work when systems jumped to 16 then 32 bit. AfterDark was killed when windows went to ActiveX display. It never hurts to think carefully about what might be gone.