After years of being ridiculous about making Windows ISO's available, Microsoft finally has provided a simple download process. The link they provided is:
http://windows.microsoft.com/en-us/windows-8/create-reset-refresh-media
I already downloaded the file and it is over 100 MB larger that the 8.1 ISO they first published last May, so it includes some changes but I have not used so I can not tell how many, or which, updates have been included.
I do not know if it can be used directly with a Win 8 product key. When I used the earlier version of the 8.1 ISO, I had to install with a KMS key and then change to my Win 8 key. Worst case, that is what may have to be done with this version as well but it is easier and cleaner than installing 8 and then going to the MS store to get the 8.1 upgrade.
http://windows.microsoft.com/en-us/windows-8/create-reset-refresh-media
I already downloaded the file and it is over 100 MB larger that the 8.1 ISO they first published last May, so it includes some changes but I have not used so I can not tell how many, or which, updates have been included.
I do not know if it can be used directly with a Win 8 product key. When I used the earlier version of the 8.1 ISO, I had to install with a KMS key and then change to my Win 8 key. Worst case, that is what may have to be done with this version as well but it is easier and cleaner than installing 8 and then going to the MS store to get the 8.1 upgrade.