I remember OS/2 Warp on a single CD that came as a cover disc for a magazine.

Installation instructions: First copy to 18 floppy disks ...

I got OS/2 2.x when IBM sold it very cheaply one time (about 60 Deutschmarks, I think). But it came on soo many floppies and had such requirements that I never got around to install it. I used the floppies years after for warez, though…

Took OS/2 Warp on a CD for me to finally give it a try. If it would've been more stable on my system, it might have postponed my journey to Linux for a few years…

Then randomly fail on like disk 10. Turn off the 'turbo' on your computer and try again (taking twice as long this time).