Jim, How are you attempting to do the upgrade install? By that I mean through the "Get Windows 10" process that showed up in the system tray where you "reserved" a copy (or are now being nagged) or via external media?
If the former, you might want to visit the Microsoft Media Creation Tool pages and see what the steps would be to update by creating the installation media on a USB drive and booting from that to do the upgrade. I suspect, though, that the issue really is that there is not enough memory needed to complete the installation. The files, once they're unzipped, probably take somewhere in the double-digits gigs of memory during the install process but are then deleted after it is complete. From what I can find online there are people who've successfully upgraded this device to Windows 10. Brian
