You could make an iso and mount it under amiga os and then install from the iso. VirtualCD (on aminet) is a nice, simple, easy to use option here with gui, etc.
This of course though would require os3.x installed 1st.
iirc I had installed it with VirtualCD and there were no problems.
but, it might be possible to simply copy install files and then Assign to a directory (instead of CD). I think that works too, if there are no fancy protections.
