According to logs, you have higher/same version of Symantec Management Agent installed on this client PC
2016-06-06 04:24:29 INFO CoreUtil: Installed agent version: 7.5.1674.11
2016-06-06 04:24:29 INFO CoreUtil: New agent version: 7.5.1674.11
2016-06-06 04:24:29 *ERRR CoreUtil: Installed agent is newer. Install aborted
Try to manually uninstall "Symantec Management Agent" on this client PC using command line
"C:\Program Files\Altiris\Altiris Agent\AeXNSAgent.exe" /uninstall
and recheck same push install.