If you are using that other operatig system reffer to this document. so you can download a svn client and follow it's documentation to checkout the files at "https://svn.sourceforge.net/svnroot/otc6/trunk".
If you are a developper with svn commit access don't forget to do so when you finish your job. In the official svn client all you have to do is type "svn commit", inside your work copy.
Forums where all this have started