If I read this correctly "reinstall 8.1 Core (OEM) on my laptop so I can reserve 10 there + keep my retail 8.1 Pro Student edition." The OS used to do the free upgrade will be 8.1 Core, then if he wants to latter he will replace 10 with the 8.1 Pro student edition that is not tied to the 10 upgrade. That should be doable.
I read upgrading a student pro changes to a windows 10 pro no more student licensing.
Windows pro & Ultimate will be upgraded to windows 10 pro.
After upgrading to windows 10 and if you have the media pack installed you should be able to download the dvd app for free from Microsoft.
I read windows starter will be upgraded to windows 10 home.
How to remove the 'Get Windows 10' app from your PC
According to Ed Bott at ZDNet.com, there will be two versions of Windows 10; Home and Pro. I've seen $109 for OEM Home, $149 for OEM Pro and $199 for a full version. There may or may not be price breaks for students. I haven't seen any yet.
Last edited by Wynona; 05 Jun 2015 at 10:50.