Want the FFXIV Beta? Sure you do, download it from here:
Then click on the button that says 'Fite Me' I tried in Internet Explorer but it didn't work, but it did work in Firefox, not sure why but it did.
Once downloaded and unziped you can install, then update.
And you will be downloading for a while so I'd go and make a cup of tea (or 10) while its doing its thing.