SEP-Client: Installation from shared folder - Problem solving

Hi all,

It is about client installation of Symantec Endpoint Protection version 14.2.3335.1000

We have a big network with hundreds of client PCs.

We have a file server where the installation files for the unattended and unmaned installation. The files were created from SEPM. We using this network folder for installation and it works great.

The support have told me that this scenaria is not officially supported and that they only support that I copy all files local. By hundred of clients this leads to problems and a lot of traffic and we need to delete after that the files and I do not know how to automatize it. Anyway it is working from network and shared folders.

I have just detected only one problem but I have a workaround on it:
If my symantec folder is on A:\aaa\bbb\ccc\SEP\1.2.3.4\ and my computer has only access to A:\aaa\ and to A:\aaa\bbb\ccc\ but not to A:\aaa\bbb\ I am receiving an error about validity of the files:

2019-07-19T17:01:36.869Z INFO  Validating package contents...
MSI (s) (58!E4) [19:01:36:877]: Incrementing counter to disable shutdown. Counter after increment: 0
2019-07-19T17:01:36.875Z INFO  Failed to get long path name for \\?\A:\aaa\bbb\ccc\SEP\1.2.3.4\. Last error: 5
2019-07-19T17:01:36.955Z INFO  Failed to get long path name for \Program Files\Symantec\Name\Version\Bin\SmcGui.exe. Last error: 3
2019-07-19T17:01:36.956Z INFO  Could not open file \Program Files\Symantec\Name\Version\Bin\SmcGui.exe. Last error: 87
MSI (s) (58!E4) [19:01:36:959]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied.  Counter after decrement: -1
MSI (s) (58!E4) [19:01:36:959]: PROPERTY CHANGE: Adding PackageIntegrityError property. Its value is '80070057'.
2019-07-19T17:01:36.956Z INFO  Package contents validation failed with HRESULT: 0x80070057
2019-07-19T17:01:36.959Z INFO  Package validation failed with HRESULT 0x80070057
2019-07-19T17:01:36.960Z DEBUG CheckPackageIntegrity end, return value: 0.
MSI (s) (58:9C) [19:01:36:962]: Doing action: CheckEmbeddedSystem

Error codes for accessing files are here described: https://docs.microsoft.com/en-us/windows/win32/deb...

Workaround: When I am copying it to A:\aaa\SEP\1.2.3.4\ it works.

Could you please

1) Inform your support about this workaround

2) Allow official support of SEP for installation from network folders

3) Repair this bug

I would be very happy. Thank you!