Download x86_64 iso for PC/laptops running 64bit processors(CPU) and/or EFI boot machines.
Most machines made in last few years has 64bit architecture.
Download i686 for PC/laptops running 32bit processors(CPU). Many machines older than few years support 32bit only.
Create bootable USB stick with the downloaded iso to either test it in live mode or install.
See: https://en.opensuse.org/SDB:Live_USB_stick for more on that topic.
For installation on real or virtual machine, create 50GB unformated partition.
Visit: http://en.opensuse.org/openSUSE:Education-Li-f-e for more information.
Use metalink client for fast download. Metalink downloads from multiple mirrors and torrent simultaneously.
openSUSE-Edu-*-latest-* is a symlink to the latest iso in the repository.
Always check md5sum before burning DVD or installing.
Have a lot of fun...