If you find bug, please report to Forums or Ticket.
You can check integrity of files by SHA1 hashes. It also signed by OpenPGP key of t_mrc-ct[at]users.sourceforge.jp. The public key could get from here or OpenPGP Keysever.
All Langpacks have not been updated since 24.0. You can use these on Tenfourbird 24.4.0.