It is available freely to those who have the full Qlik Sense platform.
The Qlik Sense Platform uses token licensing and is not server based, that means you purchase a pool of tokens that you allocate yourself for different user access on as many Qlik Sense servers as you want.
You can learn more about Qlik Sense Token Licensing here: Qlik Sense Platform - Token Licensing and Assigning Access Passes (video)
The full video series is here: New to Qlik Sense Enterprise Server Videos
Hope this helps :-)
BTW - Your screenshot is showing QlikView Personal - if you are an existing customer or partner - you will then have access to the full Qlik Sense platform download - but you would still require tokens to use the system which you must obtain from Qlik.
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