How to delete old SEP client directory ?

Hi,

How to delete the old SEP client which taking more than 2.1 GB disk space in C:\ProgramData\Symantec\Symantec Endpoint Protection after I installed the latest SEP client ?

Old Directory: 12.1.3001.165.105

New Directory: 12.1.5337.5000.105

Does it automatically deleting itself after few days or this is a bug ?