Hi Kamlesh,
You can do in two ways, both use Installation Manager(IM).
First one, if you have access to Internet from IM, you can configure a repository pointing to your product:
Here
URL repositories:
pic.dhe.ibm.com/infocenter/wasinfo/v8r0/... f.e for WAS ND 8
www.ibm.com/software/repositorymanager/c... Then click on update product, IM will get the last fixpack
The second one is download manually the fixpack, unzip in any directory and then configure a local repository. When you have configured click on update
Latest fix packs for WebSphere Application Server www-01.ibm.com/support/docview.wss?uid=s... The last one 8.0.0.8
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8 www-01.ibm.com/support/docview.wss?uid=s... Hope this helps. Tell us if you need more support
Regards