Where can I download the current AC Installer?
A current installer can be downloaded from Turbine here:
http://asheronscall.com/en/content/downloads
You can no longer install AC from the original or expansion CDs.
Once installed, connect and the launcher will automatically update and your client will update and then you'll be able to play.
If you wish to update faster you can download the data files beneath the AC download. Extract to your AC folder once AC is installed.