Come on, beta link in first post here is short link too
Indeed, and such a link can take you anywhere. The format doesn't say anything. The difference is that the link in the first post is from a trusted source, namely Waze employee. The other one comes from a forum I personally cannot read and is not an official announcement. That's a huge difference to me. Well, 'nuf said about this. Install whatever you like, really, that's up to you. The amazonaws link looks fine to me.