Thanks for the link, as I type Rift is running on my A1200, but I have 060 @66mhz as expected it's running perfect. (Ran the exe from WB3.1) I didn't have enough free Chip Ram in 3.9 to run it!
I guess these demos need an FPU and probably 060 libs to run. You can try to run them in WinUAE, I know it's not that same as real hardware but better then watching Youtube.
Or buy an 060 of course