Logon to the SEPM console
Admin --> Install Pacakge --> Client Install Package --> Add a Client Install Package
Browse to the SEP 12.1 RU4 Part-1 setup files, Go to the Additional Packages folder, you will find SEPMacLegacy.info, select that file
Give Specific name & Description.
Monitor Import Package Process, it may take few minutes.
We can see now SEP RU7 package is successfully added.
We can see now SEP 11.0.7101.0236 (RU7 MP1) package is successfully added.
After successful import you can export it any time.
To import Windows legacy package (32 bit) can refer the following article:
How to import SEP 11.x package into SEPM 12.1