Note:
Subversion servers (httpd and svnserve) up to 1.6.21 (inclusive) have security issues.

Subversion 1.6.11 for Apache httpd 2.2.x
Windows installer: Setup-Subversion-1.6.11.msi
Windows binaries: svn-win32-1.6.11.zip
Development libs and doc: svn-win32-1.6.11_dev.zip
Debug symbols: svn-win32-1.6.11_pdb.zip
JavaHL bindings: svn-win32-1.6.11_javahl.zip
Perl 5.9 bindings: svn-win32-1.6.11_pl.zip
Python 2.6 bindings: svn-win32-1.6.11_py.zip
Ruby bindings: svn-win32-1.6.11_rb.zip
README file: README.txt