While official technical support ended in 2010, some D-Link regional servers and trusted third-party repositories still host driver packages. :

: Provides a specific Revision C v5.20 package released in 2009. Compatibility and Operating System Support

is a discontinued product that has reached end-of-life status. Finding reliable drivers requires identifying your specific hardware revision (typically , Rev C , or Rev D ), which is usually printed on a sticker on the card itself. Official & Legacy Download Sources

Tech Support has Ended. This product has been discontinued. Technical support for this product has ended on 11/01/2010. support.dlink.com D-Link DWL G510 wireless card installation - Microsoft Q&A