Historically, Microsoft used to distribute Windows through Digital River, and you might find Windows 8 available there for download if you have a product key:
: Rufus is a popular tool for creating bootable USB drives. Download it from its official website. windows 8 iso file download 32 bit
: Insert your installation media, restart your PC, enter the BIOS settings (or UEFI firmware settings), set your media as the first boot device, save and exit. Your PC will then boot from the installation media, guiding you through the installation process. Your PC will then boot from the installation
Official direct downloads are no longer prominently available on the standard Microsoft software page. However, several reputable alternatives still exist: Where can I download Windows 8? - Microsoft Q&A - Microsoft Q&A Once you've downloaded the ISO
Once you've downloaded the ISO file, you'll need to create installation media: