That WeTranser link works... you just have to click on "Agree" before the download link(s) appear.
I think WeTransfer added that "agree" step maybe a year ago or so, but since then, I remember having to click this at least "almost" every time someone sent me a project that way.
I wasn't even planning on downloading that manual, but just thought I'd try what's wrong... but seems to work just fine (which is kind of odd - I thought WeTransfer deliveries were always between sender and recipient... didn't even know you can publicly share a download through them like this).