Once on the web portal, click the small “Sign In” link in the upper right. If you haven’t already done so, click the “Register” button to create an account. After that process is complete, you’ll be able to download Windows 10.
Even if you have already done the free upgrade to Windows 10 Home Edition on your personal machine, you can still use this to upgrade to Windows 10 Education (a better version). You’ll simply enter your new Windows 10 Education product key via the Windows system menu to unlock the additional features.
If you have a Mac, you can run Windows 10 Education via virtualization software such as Parallels.