How do I install Windows 8.1 (digital vr) to my first pc build?

[OORAYZA]

I'm building my first computer and for the operating system I'm going to get windows 8.1. I can get a copy free because I'm a student but it only comes in the digital version. How can I install it onto my computer?
http://duvalschools.onthehub.com/WebStore/OfferingDetails.aspx?o=cee980c6-0238-e311-93f6-b8ca3a5db7a1

 

[johnbl]

you have to download it and burn it to a CD on another computer, then use the key they provide to install the product.
look here
http://windows.microsoft.com/is-is/windows-8/upgrade-product-key-only
but during the setup you select that you want to make a CD or usb thumb drive.

you can goggle "install windows 8 with only a product key" and get better instructions.

 

[Alabalcho]

There is tool at Microsoft which allows you to make bootable USB from an ISO file you would download.

 

[OORAYZA]

How many gb should be suffice for a flash drive/DVD/CD to be able to store windows 8.1.

 

[johnbl]

http://windows.microsoft.com/en-us/windows-8/create-reset-refresh-media

basically 2.6 gigabytes for a 64 bit version, smaller for the 32 bit version.
I think i used a 4 gb drive the last time and put a bunch of extra files on it. graphics drivers setups, and tools i generally use.

How many gb should be suffice for a flash drive/DVD/CD to be able to store windows 8.1.