>Why is the Hana Client available for download? What is the use?
Well there is more to HANA Client than just REGI. It also contains the JDBC, ODBC, and Excel drivers. However for now only the 64-bit windows and linux version of the HANA Client also has REGI in it. A 32-bit Windows version of REGI is being developed and will hopefully be available soon (most likely with SPS6).