If Symantec Endpoint Protection Manager (SEPM) included SEP 12.1 RU5 is installed by user who has "C:\Windows\Temp" for TEMP/TMP environment variables, "C:\Windows\Temp" folder's permission is changed during SEPM installation.
As the result, SEPM console doesn't appear.
"C:\Windows\Temp" has all non-inherited permissions. By installation of SEPM RU5, these settings has removed.
A. Install by another administrative user who has default TEMP/TMP variables.
B. Enbale temporary folders for sessions available while installing SEPM to make sure installer will not change ACLs of C:\Windows\Temp.
1) Go to following location in registry
and set following keys' values:
fDenyTSConnections : set to 0.
fSingleSessionPerUser: set to 1.
PerSessionTempDir: set to 1.
2) Log-Off from machine and re-login.
3) Go to following location in registry
HKEY_CURRENT_USER\Volatile Environment\1 or HKEY_CURRENT_USER\Volatile
Environment\2 or HKEY_CURRENT_USER\Volatile Environment\3
and make sure following keys are present
4) Start Installing SEPM.