Shogun is in private beta and the installer is handed out by hand while that lasts, so there is nothing on this page to click. That is the honest state, not an error.
If you have already paid: your licence key is valid and nothing is lost. Tell us — include the key or your reference and we will get the file to you.
This page turns itself on the moment a build is published to the
stable channel. Nothing here has to be edited for that to
happen.