2 gigabytes (GB) (64-bit requires more RAM than 32-bit, 4GB+ is recommended). Hard Disk Space: 20 GB (64-bit).

Windows 8.1 ISO download for 64 and 32 bit | Microsoft Community Hub

: This provides an official, clean ISO straight from Microsoft servers. 3. Massgrave / Genuine Digital Archives

Because Windows 8.1 no longer receives routine security definitions from Microsoft, running a robust, third-party antivirus program is highly recommended if you intend to connect the machine to the internet.

: Check the official Microsoft Software Download page first.

Under the selector, ensure your USB drive is highlighted.

: Microsoft has discontinued official direct downloads for Windows 8.1 ISOs from its main software download pages. Alternative Microsoft Portals : Genuine ISO files can still be accessed by those with a Visual Studio (formerly MSDN) subscription Third-Party Tools : Some users utilize tools like the Windows and Office ISO Downloader

: Select your primary unallocated disk drive, click New to assign partition sizes, format the volume, and click Next to copy the core system files.

If your organization previously purchased corporate or bulk licenses for Windows 8.1 Enterprise or Professional editions, you can retrieve the unmodified media directly from the enterprise hub. Log into your company's Microsoft Volume Licensing panel. Navigate to the "Downloads and Keys" tab. Locate the x64 Windows 8.1 package and click download. System Requirements for Windows 8.1 (x64)

Rufus is a well-known, open-source utility used primarily to create bootable USB drives. It features an integrated script that pulls download links directly from Microsoft's archived servers. Download the latest version of Rufus.