Hope you understand English: 2.6.1 is the fixes_2.6 branch in SVN. The code is constantly changing because of backports of fixes from trunk/2.7.1
If you want to use it, you could try to use SVN to get this version, or e.g. Ludob's and my fpcup tool that does the same (on Linux it sets up a separate installation of Lazarus and FPC, handy if you run it under a normal, non-root user).