Hello,
You can download and install 10.0 5520 along with the latest drivers i.e driver release 48. Here is the link for the download:
Title:VERITAS Backup Exec (tm) 10.0 rev. 5520 for Windows Servers Installation Files
http://support.veritas.com/docs/277181
Title: Backup Exec (tm) 10.0 for Windows Servers revision 5520 - Service Pack 1
http://support.veritas.com/docs/278701
Title:VERITAS Backup Exec (tm) 10.0.5520 - Device Driver Installer (20051015) - Includes Tape Driver Release (20051015) and Robotic Library Release (48) (Intel Only)
http://support.veritas.com/docs/279944
Hope this helps. In case you need further details, revert.
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Regards.