Here is the copy/paste from other post where I answered very similar Q.
*********
If you are at WAS v 6.0.0.1 and wanted to be at v 6.0.2.13 then pl. do following:
1. Install Refresh Pack 2 from
http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg24009813 for your respective platform.
Make sure to download "32-bit x86 AMD/Intel AppServer"
There are several other things like plug-in fix LB fix etc.... which you need to use based upon your need.....anyway.
2. Install Fix Pack 13 from
http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg24012929 for your respective platform.
Again make sure to download "32-bit x86 AMD/Intel AppServer"
*********
Hope this helps.
Cheers
H. Kanthi