Welcome to XF2 Addons. All the XF2 addons located in the Resources area are available for download once you upgrade your account to Premium membership. In addition, Premium members will get technical support. Premium membership costs only $35.00 USD a year. Once the year has expired you can continue to use the installed addons on your forum as long as you like.
Absolutely a must have add-on. Why this isn't core functionality is beyond me. With WordPress all I have to do to updated a plugin is do is press a single "Update" button right from the Admin CP. This brings that sort of functionality to XenForo 2, which makes life so, so, so much easier!