Install process is noted on page 1220 - 1222 of the Symantec_DLP_12.0_Admin_Guide.pdf.
Initial install attempt shows all preliminary checks are met, however the deployment process to all Web Applications in SharePoint do not complete.↵When the timeout error happens the following information is displayed:
Additionally within Event Viewer under the 'Applications' section a related error post deployment attempt may exist.
Event Type: Information
Event Source: McLogEvent
Event Category: None
Event ID: 257
Time: 9:39:42 AM
User: NT AUTHORITY\SYSTEM
Description: Would be blocked by access protection rule (rule is in warn-only mode)
(Common Standard Protection revent common programs from running files from the Temp folder)
AV Admin will need to configure exclusions for SharePoint Central Administration tool.
Workaround: Disable McAfee and reboot the WFE (Web Front End) server then attempt deployment again.
NOTE: If McAfee or related AV software is not able to be configured locally you will need to contact your AV management team.