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The Intelligent Updater cannot be used with Symantec Endpoint Protection 12.1.4 and later.
Refer this guide: Unable to use Macintosh Intelligent Updater with Symantec Endpoint Protection 12.1.4
http://www.symantec.com/docs/TECH214386
MAC Can be updated either from a Symantec LiveUpdate server, an internal LiveUpdate server.
SEPM does not host or provide Macintosh definitions at this time.
The SEPM cannot host Macintosh LiveUpdate content the same way as it does for Windows clients. As of SEP version 12.1 RU6 the SEPM can be configured as a reverse proxy for downloading and caching the latest Macintosh LiveUpdate content. All Macintosh updates otherwise must otherwise occur through LiveUpdate, either from Symantec's servers or from an internal LiveUpdate server using LiveUpdate Administrator (LUA). Please see Using the LiveUpdate Administrator 2.x to download updates for Symantec Endpoint Protection for Macintosh for information on how to configure LUA for this content. Note: it is not recommended or supported for LUA and SEPM to be on the same physical server.
Refer this articel for more details: Symantec Endpoint Protection for Macintosh Frequently Asked Questions (SEP for Mac FAQ)
http://www.symantec.com/docs/TECH134203
Go through this article as well: Management features based on platform