Recent posts indicate you will be able to upgrade to Win 10 and then do a ”clean“ install over the upgrade with the same Win 10 download. This type install was available with Win 7 upgrades. Search the web for more info.
What is Dell's position on upgrading to Windows 10? I bought an Inspiron 3847 earlier this year and currently run Windows 8.1. I've been told by MS that I 'qualify' for their 'free upgrade' when Windows 10 is released at the end of next month, July. As I understand it, this 'free upgrade' will only preform a 'warm upgrade' on a current Windows 7.1 or 8.1 base. A 'cold' build will not be possible.
Upgrading to Windows 10