... when Google Analytics isn't loaded.
<div class="dwnldBtn"><a onclick="ga('send', 'event', 'Downloads', 'Minion-Win', { 'hitCallback': function() { document.location = 'http://cdn.mmoui.com/minion/Minion2.0.11b-beta.exe'; }}); return false;" href="http://cdn.mmoui.com/minion/Minion2.0.11b-beta.exe"></a></div>
That "return false" is the problem. If GA really requires hardcoded onclick handlers, you can at least wrap it in a check so it doesn't break the link when GA isn't available:
<div class="dwnldBtn"><a onclick="if(window.gaGlobal){ga('send', 'event', 'Downloads', 'Minion-Win', { 'hitCallback': function() { document.location = 'http://cdn.mmoui.com/minion/Minion2.0.11b-beta.exe'; }}); return false;}" href="http://cdn.mmoui.com/minion/Minion2.0.11b-beta.exe"></a></div>
This currently affects the download button itself, and the links right below it for downloading for other operating systems.