Hi,
If you are looking for a on premise version of SAP HANA, download SAP HANA Platform Edition from SAP Service Marketplace - Home and install on a supported environment. Note that software carries a temporary license with a validity, so before the this license expiry, get a Permanent License from http://service.sap.com/licensekey.
For information on Licensing refer SAP Note: 1644792.
For information on SAP HANA Developer edition, refer: SAP HANA Developer Center
Do you have more questions feel free to ask.
Regards,
Sadanand Bhat