It does seem like you can't get to the forums without an AltiumLive login. Google searches related to Altium generally return documentation pages (often for older versions), but never seem to return relevant threads in their forums. I'm currently evaluating Altium so I have a login, but I wonder if it will still work once my eval period is up. I'm honestly a little worried that I might spend $6K for a product, decide not to renew the maintenance for whatever reason, and then lose access to those forums. I can't think of another PCB CAD package that essentially puts a paywall in front of their web forums.