can I download it to my thumb drive and use that to boot to?
It should be possible. I've never had the need to try booting from USB though.
Bootable USB with Rufus
Rufus is widely considered to be the fastest and most reliable tool for the creation of a bootable USB. It also supports UEFI (“Unified Extensible Firmware Interface”), a new mainboard firmware that replaced the old BIOS and can already be found on almost all newer computers. From Windows 8, it’s also possible to install “Windows2Go” as a portable operating system on an external storage device with Rufus.
Operation of the tool is simple:
- Open the program with a double-click
- Select your USB drive in “Device”
- Select “Create a bootable disk using” and the option “ISO Image”
- Right-click on the CD-ROM symbol and select the ISO file
- Under “New volume label”, you can enter whatever name you like for your USB drive
- You’ll receive the warning “ALL DATA ON THIS DEVICE WILL BE DESTROYED”, which you can confidently confirm with “OK”– at this point, you’ve ideally already saved any important files from the USB drive
- Click on “Start”
- As soon as the green bar is full, click on “Finish”
- Eject your bootable USB drive with “Safely eject hardware”