Historically Symantec Endpoint Encryption has separate installers for the Autologon client. If you wanted to take advantage of the Autologon client for Windows upgrade deployments, or Kiosk situations, you needed to create a separate Autologon client installer.
Symantec Endpoint Encryption 11.3.1 has now included the Autologon client so it is part of the main SEE Client installer application. Once you have upgraded to the SEE 11.3.1 client, which includes the SEE Autologon client built in, the legacy Autologon client will remain in the programs list.
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The legacy Autologon client can be left installed on the system as it does not cause any issues doing so, but if you would like to uninstall this from the system, first upgrade to SEE 11.3.1, which has the Autologon client built in, and after this has completed and you've rebooted the machine, then you can uninstall the Legacy Autologon client from the program list.
Symantec Enterprise Division has developed an uninstall script that can be used to automate the uninstaller operation. If you wish to get this script, please request it from Symantec Support.