The best way is to download the IBMIM (IBM Installation Manger) separately, Once downloaded, you can manually set the following repositories to use with in IBMIM to download your version of WAS 8.
You can use Installation Manager on your local system to update WebSphere Application Server Version 8.0.0.0 with the interim fixes from the live web-based repositories at the following locations:
Application Client for IBM WebSphere Application Server:
http://www.ibm.com/software/repositorymanager/V8WASSupplements
Application Client for IBM WebSphere Application Server (ILAN):
http://www.ibm.com/software/repositorymanager/V8WASSupplementsILAN
DMZ Secure Proxy Server for IBM WebSphere Application Server:
http://www.ibm.com/software/repositorymanager/com.ibm.websphere.NDDMZ.v80
IBM Web Enablement for IBM i
http://www.ibm.com/software/repositorymanager/com.ibm.websphere.WEBENAB.v80
IBM WebSphere Application Server:
http://www.ibm.com/software/repositorymanager/com.ibm.websphere.BASE.v80
IBM WebSphere Application Server – Express:
http://www.ibm.com/software/repositorymanager/com.ibm.websphere.EXPRESS.v80
IBM WebSphere Application Server for Developers:
http://www.ibm.com/software/repositorymanager/com.ibm.websphere.DEVELOPERS.v80
IBM WebSphere Application Server for Developers (ILAN):
http://www.ibm.com/software/repositorymanager/V8WASDeveloperILAN
IBM WebSphere Application Server Network Deployment:
http://www.ibm.com/software/repositorymanager/com.ibm.websphere.ND.v80
IBM WebSphere Application Server Network Deployment Trial:
http://www.ibm.com/software/repositorymanager/V8WASNDTrial
Web Server Plug-ins for IBM WebSphere Application Server:
http://www.ibm.com/software/repositorymanager/V8WASSupplements
Web Server Plug-ins for IBM WebSphere Application Server (ILAN):
http://www.ibm.com/software/repositorymanager/V8WASSupplementsILAN
From: http://www-01.ibm.com/support/docview.wss?uid=swg27021731
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