You can install additional options, such as the Library Expansion Option, when you install Backup Exec.
See Installing Backup Exec to a local computer.
However, if you have already installed Backup Exec and want to install additional options, you should first review the documentation for that option to ensure that you have met all minimum requirements.
If you installed the Evaluation version or the Not For Resale (NFR) edition of Backup Exec, you can install evaluation versions of the additional options. If you have a licensed version of Backup Exec, you can evaluate most options and agents for a specified period of time.
See Evaluating Backup Exec agents and options.
The Backup Exec services are stopped while the additional options are installed. If any active jobs are running, you are prompted to stop them, or to wait for the jobs to finish.
See Pausing and resuming a managed media server in CASO.
To install Backup Exec options to the local computer
Start Backup Exec for Windows Servers or verify that it is running.
On the Tools menu, click Install Options and License Keys on this Media Server.
Verify that the additional options are selected for installation, and then click Next.
If you are prompted, enter information or choose settings for additional options that you want to install. Click Next after each selection.
Read the Backup Exec installation review, and then click Install.
The Backup Exec services are stopped while the additional options are installed. If any active jobs are running, you are prompted to stop them, or to wait for the jobs to finish.
When the installation is complete, the services are restarted.
More Information