Normally, you use the bundle to upgrade all the software packages at the same time. They can also be upgraded individually. When upgrading to a new release, use the bundle; do not upgrade the packages individually.
To determine which packages are running on the router and to get information about these packages, use the show version command at the top level of the CLI.
Download the software packages you need from the Juniper Networks Support Web site (http://www.juniper.net/support/). To download the software packages, you must have a service contract and an access account. If you need help obtaining an account, contact your Juniper Networks sales representative or go to http://www.juniper.net/pwassistance.htm ...