To start Elastic you have to install it with installer from CD! Seems that main-file is converted during installation to your choosen system. There are some versions on CD: 68K (020,030,040,060) and PPC (PowerUP/WarpUP) and then there are drivers (showing-modules) for ECS/AGA, CGFX(!!), P96, Grafiti, Retina.....etc.

But:
There is no way (I found none) to set mainscreen at beginn. It seem that there is always opened a 640x480 58Hz-Screen, which my LCD (PowerMac G5) cannot handle (out of range) - so I cannot say whether Elastic is now running or not...(it seems it does, but takes over whole system....)
On my A3K it opens a 640x480x24Bit P96 screen, which I have never choosen. I think installer does set this automatically, when choosing a showing-module....