My salesforce has a latest upgrade for API32.0. So by default when i generate partner WSDL I get that in my WSDL. How do I generate PARTNER WSDL for a older version say 30.0
I don't think there is option in SFDC to get older version of WSDL.
One thing you can try is search for tools/ code library which used SOAP API and get WSDL from that.
One such example is PHP toolkit.
For your reference here is WSDL ver 27.