Depending on the version of Windows 8 you wish to download, there can be multiple ways in which you can download Windows 8. The best way to download Windows 8 is in the form of a .iso file using a download manager software like getright, download accelerator, etc. .iso files are compressed disk image or in other words, they are as good as a physical disk. In order to download Windows 8 in a iso file format using a download manager software, you would need to get a link to iso file of Windows 8 and a good internet connection. As of now, you can download the latest version of Windows 8 totally for free from Microsoft website. Current download of Windows 8 available using direct link is a Release Preview of Windows 8 and the final version of Windows 8 would be released soon by Microsoft.
Installation of Windows 8 comes after you have successfully downloaded Windows 8 and it is as easy as any other software installation. In case you do have a latest computer, there is a good possibility that you would not need to download and install any driver for your new Windows 8 computer. In case you have not installed a Windows Operating System before, it would be a good idea to fully understand the download and installation steps before attempting to download and install Windows 8 on your desktop or laptop computer. The Latest Version of Windows 8 on this date is offered by Microsoft for free which will expire on a future date and hence must be used only for testing and understanding of Windows 8.
64 bit of Windows 8 is available for download and 32 bit of Windows 8 is available for download as well. Some special software applications like Adobe After Effects work only on 64 bit of Windows 8, whereas most of the software applications work fine on 32 bit and 64 bit versions of Windows 8. Apart from Software Dependence, the maximum amount of RAM your Windows 8 computer can use depends on whether you are running 32 bit or 64 bit of Windows 8. Maximum amount of RAM a 32 bit Windows 8 would be able to use is around 4 GB and in case you want to use more than 4 GB of RAM for your Windows 8 computer, you must download 64 bit version of Windows 8.