The patch can be downloaded from here:
https://support.quest.com/download-install-detail/6111085
Installation Instructions
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Installing the Support Pack (pch_csseries-12-4-0-15-AnyPlatform.npk)
1. In the Navigation pane, click Manage Clients.
2. In the NetVault Backup Clients table, select the client on which you want to install the plug-in, and click Manage.
3. At the lower-right corner of the Installed Software table, click the Install Plugin button (+).
4. Click Choose Plug-in File, and in the browse window, navigate to the location of the “.npk” installation file for the plug-in
5. Select the file named pch_NDMPC-11-4-5-8.npk, and click Next to begin installation.
6. After the plug-in is installed successfully, a message is displayed.
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To Determining if This Hotfix/Patch Is Installed:
1. In the Navigation pane, click Manage Clients.
2. In the NetVault Backup Clients list, select the client on which the plug-in is installed, and click Manage.
3. In the Installed Plug-ins table, look for the "Fujitsu CS Series Virtual Library Support Pack" description to verify installation.
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To remove this hotfix/patch:
1. In the Navigation pane, click Manage Clients.
2. In the NetVault Backup Clients list, select the client on which the plug-in is installed, and click Manage.
3. In the Installed Plug-ins table, select "Fujitsu CS Series Virtual Library Support Pack" package, and click the Remove Plugin button (-).
4. In the confirmation dialog box, click Remove.