We go to considerable effort to insure that advance releases are stable, and we expect they should work just fine. However, they are (by definition) "advance" -- they have not yet undergone the rigorous testing we normally apply before we post a release version of PC2 for the general user community. TUG members are those brave souls who are willing to accept the risks in order to reap the rewards of getting the latest features and bug fixes as soon as they become available.
To join the PC2 TUG, you must sign up for the pc2tug mailing list. You will then receive a reply message giving you a URL pointing to the TUG builds page. (You can if you wish then delete yourself from the mailing list, but we hope you won't; we use the mailing list to keep people apprised of the status of releases posted on the TUG page and deleting yourself would cut you off from that information.)
Join the pc2tug mailing list.