Important Note: This method is valid only if you have a product key for Windows 8/ Windows 8.1
If you bought a Windows 8.1 or Windows 8 product key, you can download and install Windows. You’ll have the option to install Windows now, later, or using media with an ISO file. If you can’t find your product key, check your online order info, confirmation email, or DVD packaging.
Step 1:
First step is to download this file from Microsoft- WindowsSetupBox.exe. Now run this exe file and you will be prompted to enter the product key. You can either enter your existing Windows 8 license or the new Windows 8.1 license.
Now the installer will check and validate the key.
Related Reading: How to Upgrade from Windows 8 to Windows 8.1
Step 2:
Now the set up will show that Windows 8.1 is available for download for your PC. Click Next and set up will start download Windows 8.1
You need to wait till the downloading process is complete. The download is approximately 3.6GB in size, make sure you are not on a limited data plan or on metered internet connection.
Step 3:
Once the download is complete, it will check for the download. In the next step you will be shown three options. First option is to install Windows 8.1 right away, second is to create media and final step is to install Windows 8.1 from desktop later on. Now select Install by Creating media option.
Step 4:
In the next screen, you need to select ISO from the two options available (two options available are USB and ISO).
Step 5:
In the final step, the set up will create the ISO file for Windows 8.1 on the location you specify. You can use this ISO to manually upgrade all your Windows 8 PCs to Windows 8.1 without having to download the update on all machines.
Now, you will have the ISO saved on your PC and from there you can use it to upgrade other PCs or install on other PC.
