To download any software from SAP Market place, first of all, you will need to be an existing SAP customer.  If you are one of those that are authorized to access the SAP site, you'll be assigned an OSS ID which allowed you to report problems, search for SAP notes as well as request SAP related software on behalf of your company.

Please note that the following url and path might change after the time of writing this:

Download the latest SAPGUI

http://service.sap.com/swcenter
- Ordering SAP Software
-- SAP Frontend
--- SAP Frontend GUI/ITS
---- SAP Frontend (GUI/ITS) 620 Comp.5

Download SAPGUI 610 Patches

http://service.sap.com/SWCENTER-MAIN
SAP R/3
..SAP R/3 4.6C
...Binary Patches
....SAP GUI FOR WINDOWS 6.10
.....Win32
-----GUI610.EXE

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SAP ABAP/4 Programming, Basis Administration, Configuration Hints and Tips