You can start at this link for the download of ESXi 5.x - https://my.vmware.com/web/vmware/evalcenter?p=free-esxi5&lp=default. You'll need to register before you download. Even with the free edition you have to enter a license number which you'll get on the "License and Download" page. Should you decide to move to a paid edition, you'll just have to change the license key.
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