As planned, Team Fortress Classic for Half-Life has been released, which will update your Half-Life executable to a new version 1.0.0.9. You can get the patch via the Half-Life auto-update feature, or here are pages with local copies and mirrors of all four new releases. Here is the 1.0.0.5 to 1.0.0.9 update (20.5 MB), here is the 1.0.0.8 to 1.0.0.9 update (19.0 MB), here is the Standard Half-Life SDK (13.5 MB), and the Standard SDK source code (713 KB).