Did you reboot? Found this:
MSI (s) (24:B0) [10:51:20:975]: Product: Symantec Endpoint Protection -- 4Symantec Endpoint Protection has detected that there are pending system changes that require a reboot. Please reboot the system and rerun the installation.
MSI (c) (00:58) [10:51:12:334]: Font created. Charset: Req=0, Ret=0, Font: Req=, Ret=Arial
4Symantec Endpoint Protection has detected that there are pending system changes that require a reboot. Please reboot the system and rerun the installation.
If you've already rebooted, use regedit and navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SessionManager\
Delete the PendingFileRenameOperations registry value from the right pane.
Immediately run the installer again (DO NOT reboot after deleting the key).
Now should install.