Hi,

You need the Net; or download the 8.1 ISO on someone else's machine.

Use the media creation tool (aprx. 1.41MB) to download Windows. This tool provides the best download experience for customers running Windows 7, 8.1 and 10. Tool includes: File formats optimized for download speed. Built in media creation options for USBs and DVDs. Optional conversion to.

If the above Microsoft method does not work:

Read this information: Windows 8.1 - Update to from Windows 8

Or save your Data and do a clean install of the exact same edition of 8.1 as 8 is.

Windows 8 > 8.1 is a free upgrade released by Microsoft and this is a workaround if you are unable to get it via the Store, etc.

@@@@@@@@@@@@@@@@@@@@@@@@@@

You can download and create your own Windows 8.1 Installation Media to reinstall the Operating System with..

'Create installation media for Windows 8.1'

'Download Windows 8.1'

A similar Tutorial which may also assist you

'Create Installation Media for Windows 8.1'

In the first screen of this very simple wizard, you need to choose the following:

Language. English – en-us if you're in the United States.

Edition. Windows 8.1 (Core), Windows 8.1 N, Windows 8.1 Pro, Windows 8.1 Pro N, or Windows 8.1 Single Language.

Architecture. 64-bit (x64 ) or 32-bit (x86).

_______________________________________

'How to Create a Bootable USB or DVD with a Windows 8 or 8.1 ISO'

Warning

_____________________________________

How to clean install:

'How to Do a Clean Install of Windows 8 or Windows 8.1'

Make sure that you read Section 4

_____________________________________

With Windows 8/8.1 The Product Key on preinstalled Operating Systems (HP, Acer, etc) is embedded in the BIOS in the Motherboard, so that the lost and/or worn C.O.A. Sticker problem is no more.

When you reinstall it will pick up the Product Key and activate the system automatically.

If it does not, follow these steps:

'How to Activate Windows 8 and 8.1 by Phone'

Windows 8 Bit Iso Download

'Get help with activation errors'

Windows 8 Offline Iso Download Free

'How to activate a Microsoft product by using Microsoft Product Activation Center'

_______________________________________________

If you do wish to/need to keep a record of it:

'Windows 10 Embedded Product Key Tool'

'We’re proud to introduce the immediate release of our newest utility for Windows users: the NeoSmart Technologies Embedded Product Key Tool. Designed for users of Windows 7, Windows 8, and Windows 10, our embedded product key tool will retrieve and display the Windows setup product key embedded in the BIOS or EFI, allowing you to store it for safe-keeping or use it to reinstall Windows with an official Windows setup image.'

You can also use:

'Belarc Advisor - Free Personal PC Audit (Version 8.5c)'

Or:

Windows 8 Offline Iso Download Windows 7

'Product KeyFinder'

Windows 8 Offline Iso Download Windows 10

Cheers.