Nope.
Used to be that if you had a still supported version, if you provided both the base serial and the newer agent serial, that Veritas would provide a valid older agent serial
If you hvae the disk space available, you could schedule a Dump-to-Disk from within SQL, and then do a flatfile backup of the dump file
or
EBAY (usually) and ISellSurplus.com (often) have older BackupExec Serials for sale