There are two ways of updating the client and our custom launcher: downloading a new version or automatic updates.
To download a new version, check out the Software Downloads page, download and save the file in c:\AltAway - if it is a zip file, you will then need to extract the contents to that folder.
Auto-updates can be triggered after clicking Login in the launcher. These are infrequent but you need to do nothing but wait for them to complete, then you can login again.