If you specifically need an "Industry" or "Embedded" version, Microsoft still hosts evaluation ISOs on their Download Center . These are often used for specialized hardware but can be used for general testing. Key Considerations
Click the small arrow next to the "SELECT" button and change it to . Click DOWNLOAD to open a selection script. Download WIN8 1X64 4in1 ENU iso
: Once downloaded, you can use tools like Rufus to "burn" the ISO onto a USB drive for installation. Windows 8.1 English ISO File - Microsoft Q&A If you specifically need an "Industry" or "Embedded"
: Choose "English" (or your preferred ENU version) and click Confirm . Download WIN8 1X64 4in1 ENU iso
: Select the 64-bit Download button. The link is typically valid for 24 hours from the time of creation.