Never to be honest.An realy don't know how.
Go the the poker tracker site and download the latest beta (30.5) as of yesterday.
Invoke the program that downloads to your system and sit back, other than starting it you probably won't have to do much.
Alternatively, if you have been using any beta, simply closing and re-opening PT3 should get you a message window with a link sending you to the proper spot to download the latest and greatest version. You may need to remember your PT login name so dig that out.