Programmatically collecting Backup Exec version from endpoints

Hello, we are trying to figure out how we can get the installed version of backup exec on all our endpoints with a script.
according to this article one should look at the add remove programs page or Backup Exec's about page.
https://www.veritas.com/support/en_US/article.100054473
add remove programs collects the information from the registry "DisplayVersion" key located under
"Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Veritas Backup Exec 21.0" which value for the test machine is "21.0.1200"
However, seems that it is not updated with the software, as backup exec is updated to "Version 21.4 Rev. 1200.2536" according to the about page. Where can i look to programmatically extract this "21.4.1200.2536" version?

Additionally, checking the versions of some of the executables they seem to be on version "21.0.1200.2536" which is neither here nor there, would love it if you can shed some light on these discrepancies,

Thanks,

V.