Hi Mah,
You'll find the central documentation page for SAP HANA here: SAP HANA Platform – SAP Help Portal Page On Help Portal, you will only find the latest release. For older versions you can go to http://service.sap.com/hana
The diect link to the SAP HANA Studio installation guide is here: http://help.sap.com/hana/SAP_HANA_Studio_Installation_Update_Guide_en.pdf
Regards,
Sven