Bypass Product Key When Install Windows 8.1 without a Product Key, So you’ve got a Windows 8.1 ISO, but it is not letting you start the installation
before inputting the product key? This is because Windows setup finds out which version to install from the Product Key and hence product key is needed before proceeding with the installation. But what if you want to install and trial Windows 8.1 before purchasing? You can easily force the setup to skip the Product Key check and proceed with the installation.