Windows 8 Enterprise & Windows 8 Enterprise Evaluation users will need to download the Windows 8.1 Preview ISO files following this link.

Windows 8.1 ISO download A user on Reddit, called TOM has posted a little trick that lets a Windows user download the Windows 8.1 ISO using a legitimate retail Windows 8 product key.

Windows 8 users who want to upgrade to Windows 8.1 without having to go through the Windows Store can use this trick to download the ISO with the Windows 8 product key.

How to install Windows 8.1 for free Once you have the Windows 8.1 ISO on your hard drive, the installation process is painless.