Hello,
To upgrade from Backup Exec v9.0 to Backup Exec 9.1 for Windows Servers revision 4691, we would suggest you download and install it using the following technotes:
http://seer.support.veritas.com/docs/264342.htm
http://seer.support.veritas.com/docs/262414.htm
# BEWS 9.1 is a free downloadable upgrade inclusive of previously installed agents and options from Backup Exec 9.0 for Windows Servers agents and options.
# Update all agents/options on all remote systems.
Hope this helps you.
Regards
Additional Information :
For information on the recent VERITAS Backup Exec security vulnerabilities, including links to the downloads for the necessary hotfixes, please refer to the following document:
Patch summary for Security Advisories VX05-001, VX05-002, VX05-003, VX05-005, VX05-006, VX05-007
http://seer.support.veritas.com/docs/277429.htm
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