EDIT: Actually, there's one more option: installing to a small hard disk image file. But it's very complex to set up and I'm not even sure of the details. There's info kicking around the net if you want to try this route.
Also, a RAD disk would be an option as well (providing you have ram to spare). Easier than a disk image file, but the RAD mount list would have to be edited to increase its capacity to however large it needs to be. I think it's 79 cylinders for a standard floppy, so multiply that by 4 for a 4 disk install.
EDIT:
...........So the idea being once the game has installed onto your giant 'virtual floppy', you can then simply drag it across onto your hard drive............