Veritas Backup Exec 9.1 Rev. 4691 service pack downloads?

My situation is identical to this:

http://www.symantec.com/connect/forums/veritas-backup-exec-91-rev-4691-service-pack-downloads

However, the "solution" has vanished.

Budget is zero for updating software on this old Win2000 server.

Could someone, please, direct me to the servicepack(s) that will bring my 9.1 up to date?

Thanks.