The Tu-154 is out of "beta" mode, and has reached official public release version 1.0.
Previous users may recall that beta 1 was released in November 2011, followed by beta 2 and beta 3. These betas were still more refined than many other freeware developers' final releases, and progress continued until PT was happy enough to settle on a widely publicized version.
Yet more changes have been made since the beta days, and now we have an official public release version 1.0!
Kirill recommends deleting the old beta versions prior to using this installer.
Additionally, and as always, I provide learning assistance for the Tupolev Tu-154 at my training center here:
Let me know if you have any questions.