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To download installer, refer to the website http://subversion.apache.org/packages.html.
Download svn installer from any of the distributor of your choice. Run the downloaded svn installer and complete the installation by referring to httphttps://wwwsvn.subversionaryapache.org/howto/setting-up-a-server-on-windows/repos/asf/subversion/trunk/notes/windows-service.txt.