Adding more info, runtime can be downloaded only from SAP Market place. SDK is available both in SCN and AP Market place,http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/webcontent/uuid/f00164c9-bcb7-2f10-d2b3-ac79a6faf833
A 30 day trial was available from SAP (SUP 2.2). It was discontinued. SMP 3 trial will be available soon.
-Midhun VP