There is a bug in the following Javascript on the page:

function validate(aForm)
{
if (cookies_enabled() == true)
{
checkForSelection (aForm);
}
else
{
alert ("You must have cookies enabled to proceed.");
}
}

Apparently, cookies_enabled() is unreliable under both Safari and OmniWeb. To fix this, either change the condition to true or use one of the direct download links someone has been kind enough to post below.