You can also install SAP HANA Studio from SAP Market place with a valid user license. You need to have SAP Partner ID (SID) and password to login to SAP Market place. This is paid version and you should have a license for SAP HANA Studio. You can also install all the patches and upgrades related to SAP HANA from Marketplace.
Go to http://support.sap.com and navigate to Software Downloads.