Is this issue resolved?
If not, have you tried installing a Embedded or VDI client ?
https://support.symantec.com/en_US/article.HOWTO125352.html
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Uses virus and spyware definitions in the cloud.
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Installs only the latest virus and spyware definitions.
The client is approximately 80 percent to 90 percent smaller on disk than dark network Windows clients because they download only the latest definitions
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The embedded/VDI client includes more size optimizations than the standard client:
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The installer cache does not save after installation completes. This change means you cannot remove or modify the installation through the Control Panel unless you first copy the installation package to the client computer.
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The embedded client employs NTFS compression on more folders than the standard client.
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Handles AutoUpgrade with full installation packages; cannot use deltas.
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For any embedded clients that are not connected to the cloud, Symantec recommends that you install and enable all protection technologies. These protection technologies include the firewall, Download Insight, intrusion prevention, and SONAR. Symantec also recommends that you use system lockdown to ensure the highest level of security.
Note: If you configure embedded images for Windows Embedded Standard 7 and later with templates, all templates except for Minimum Configuration work well with Symantec Endpoint Protection. The supported write filter is the File Based Write Filter (FBWF) with the Registry Filter. If the write filter status is incompatible with the installation, the Symantec Endpoint Protection installer alerts you to the changes you need to make.
Symantec Endpoint Protection support for Windows Embedded
Regards,