Older releases of Subversion built by D J Heap
Packed as msi by myself using Troy Simpson's WiX Installer provided in the Subversion source
Zip-packages and bindings can be found at Tigris file area

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

Subversion 1.6.x for Apache httpd 2.2.x
Windows installer 1.6.6: Setup-Subversion-1.6.6.msi
Windows installer 1.6.5: Setup-Subversion-1.6.5.msi
Windows installer 1.6.4: Setup-Subversion-1.6.4.msi
Windows installer 1.6.3: Setup-Subversion-1.6.3.msi
Windows installer 1.6.2: Setup-Subversion-1.6.2.msi
Windows installer 1.6.1: Setup-Subversion-1.6.1.msi
Windows installer 1.6.0: Setup-Subversion-1.6.0.msi
Subversion 1.5.x for both Apache httpd 2.0.x and 2.2.x
Windows installer 1.5.6: Setup-Subversion-1.5.6.msi
Windows installer 1.5.5: Setup-Subversion-1.5.5.msi
Windows installer 1.5.4: Setup-Subversion-1.5.4.msi