SEPM 14.2 is not free. A standard enterprise license costs hundreds (if not thousands) of dollars per server. The only legal "free" version is the trial, which typically expires after 60 days. This trial requires you to register with an email address and download the software directly from Broadcom (which acquired Symantec’s enterprise division).
This is where the search for a "repack" begins. symantec endpoint protection manager 142 download repack
If you absolutely must use 14.2 for a certification lab (e.g., for the old "STS" exam): SEPM 14
Do not search for "repack." Follow these steps instead: If you absolutely must use 14