Symantec Encryption Desktop 10.4 for Mac OS X adds compatibility with the Mac OS X 10.11 platform.
Before you encrypt a disk (or re-encrypt a disk after reinstalling Symantec Encryption Desktop ), ensure that the System Integrity Protection feature in Mac OS X 10.11 is disabled. You can enable System Integrity Protection again after disk encryption is initiated.
Symantec recommends that you disable System Integrity Protection while the computer is rebooting after you install Symantec Encryption Desktop. In the event that an automatic encryption policy is effect, this will ensure that System Integrity Protection is already disabled when disk encryption begins automatically.
If you need to re-install Symantec Encryption Desktop, make sure that you disable System Integrity Protection before you run the installation package.
For information about disabling and re-enabling the System Integrity Protection feature, refer to the official Mac OS X 10.11 documentation. Information on how to run through these steps can also be found in article TECH235027.
On systems that have been upgraded to Mac OS X 10.11.4 from previous versions of Mac OS X 10.11, Symantec Encryption Desktop might terminate abruptly or the system might become unstable. This issue has not been observed with fresh installations of Mac OS X 10.11.4.
Note: Any version prior to Symantec Encryption Desktop 10.4 was not supported on El Capitan. Before attempting to use Symantec Encryption Desktop on any version of El Capitan, please verify the version running is Symantec Encryption Desktop 10.4. If Symantec Encryption Desktop 10.3.2 or previous is installed on El Capitan, please uninstall and then install Symantec Encryption Desktop 10.4 before attempting to encrypt the system.