To download and install Windows 8 on a PC currently running Windows 7, you must obtain a valid ISO disk image and choose between a direct upgrade or a clean installation. While Microsoft has officially ended support for Windows 8, you can still find official download resources and guides for the transition.
Before downloading, ensure your Windows 7 PC meets the minimum hardware requirements. Generally, any system capable of running Windows 7 can comfortably run Windows 8. Windows 8.1 ISO download for 64 and 32 bit download windows 8 for pc windows 7