The Encore 7 simply does not have enough storage space to install Windows 10.  Even with downloading Window 10 to an micro SD card instead of the C: drive, there isn't enough space to complete the install.

The Windows 10 installation always failed due to insufficient space.  So how to get it?  The instructions are complicated, but following them will allow you to install Window 10 on your Encore Mini 7.

The video includes the failures as well as the final success in the upgrade.  So if you have run into these problems, be optimistic. You can still install Windows 10.

Here's the links to the hardware and software that you will need to install Windows 10 on the Toshiba Encore Mini 7.

Windows 10 Download and USB tool: https://www.microsoft.com/en-us/software-download/windows10

Toshiba Mini Support Site for Bios Upgrade:
http://support.toshiba.com/support/modelHome?freeText=1200009086

Hardware:
USB Hub:
http://smile.amazon.com/gp/product/B00BWF5U0M?psc=1&redirect=true&ref_=oh_aui_detailpage_o05_s00

On-the-Go Drive - Micro/Standard USB :
http://smile.amazon.com/gp/product/B00LIXJ0RM?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00

Double Female USB:
http://smile.amazon.com/gp/product/B00J4NMTMQ?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00

Charging-Data Y Cable:
http://smile.amazon.com/gp/product/B0047AALS0?psc=1&redirect=true&ref_=oh_aui_detailpage_o07_s00

Micro SD 64GB:
http://smile.amazon.com/gp/product/B00IVPU7AO?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00

5 Port Charger:
http://smile.amazon.com/gp/product/B00KBMRNQG?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00

Rotation doesn't match the tablet's orientation? Here's my post on the Toshiba Forums for a fix.  My entry is at the end of the page.

http://forums.toshiba.com/t5/Encore-Tablets/Toshiba-Encore-mini-rotation-screen-works-reverse/m-p/673688/highlight/true#M10423