DVD-ROM Required for Zorin Educational ? Why ?

I am running Zorin OS 5 Lite on an old Pentium 3 1 ghz CPU with 384 ram and it works quite well. In keeping with the goal of utilizing older machines with low specs, why bring out the Educational version in a size that requires a DVD to load. Most older hardware usually has just a a CD-ROM or maybe a CD-RW but few have DVD ROM's or DVD-RW's. And most older hardware have BIO's that don't allow booting from a USB stick.

I would suggest bringing out the Educational version on one or even two CD's to allow it to be used in older machines. That, or issue a CD with just the Educational software on it and make it compatible with the OS 5 Lite or have the Educational software in a separate "folder" or what ever in the software upgrade section.